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Sports Center

  • Blood Blood

    Without blood, our organs couldn't get the oxygen and nutrients they need, we couldn't keep warm or cool off, we couldn't fight infections, and we couldn't get rid of our own waste products. Find out about the mysterious, life-sustaining fluid called blood.

  • Bones, Muscles, and Joints Bones, Muscles, and Joints

    Our bones, muscles, and joints form our musculoskeletal system and enable us to do everyday physical activities.

  • Brain and Nervous System Brain and Nervous System

    If the brain is a central computer that controls all the functions of the body, then the nervous system is like a network that relays messages back and forth to different parts of the body. Find out how they work in this Body Basics article.

  • Digestive System Digestive System

    Most people think digestion begins when you first put food in your mouth. But the digestive process actually starts even before the food hits your taste buds.

  • Endocrine System Endocrine System

    The endocrine system influences almost every cell, organ, and function of our bodies. It is instrumental in regulating mood, growth and development, metabolism, and sexual function, among other things.

  • Eyes Eyes

    Although your eyes are small, their structure is incredibly complex. Find out how they work in this body basics article.

  • Female Reproductive System Female Reproductive System

    Why do girls get periods? What goes on when a woman gets pregnant? What can go wrong with the female reproductive system? Find the answers to these questions and more in this article for teens.

  • Heart and Circulatory System Heart and Circulatory System

    The heart and circulatory system (also called the cardiovascular system) make up the network that delivers blood to the body's tissues.

  • Immune System Immune System

    The immune system is made up of special cells, proteins, tissues, and organs that defend people against germs and microorganisms. It's the body's defense against organisms and substances that invade our systems and cause disease.

  • Kidneys and Urinary Tract Kidneys and Urinary Tract

    The kidneys perform several functions that are essential to health, the most important of which are to filter blood and produce urine.

  • Lungs and Respiratory System Lungs and Respiratory System

    Each day you breathe about 20,000 times. Find out more about the lungs and breathing process.

  • Male Reproductive System Male Reproductive System

    What makes up a guy's reproductive system and how does it develop? Can anything go wrong? Find the answers to these questions and more in this article.

  • Metabolism Metabolism

    Your body gets the energy it needs from food through a process called metabolism. Get all the facts on metabolism in this article.

  • Mouth and Teeth Mouth and Teeth

    Did you know that your mouth is the first step in the body's digestive process? Or that the mouth and teeth are essential for speech? Learn about the many roles your mouth and teeth play.

  • Skin, Hair, and Nails Skin, Hair, and Nails

    Our skin protects the network of tissues, muscles, bones, nerves, blood vessels, and everything else inside our bodies. Hair and nails are actually modified types of skin.

  • Spleen and Lymphatic System Spleen and Lymphatic System

    The lymphatic system is an extensive drainage network that helps keep bodily fluid levels in balance and defends the body against infections.

  • Sports Center Sports Center

    This site has tips on things like preparing for a new season, handling sports pressure, staying motivated, and dealing with injuries.

  • Concussions: Alex's Story Concussions: Alex's Story

    Alex plays high school football, track, basketball, and lacrosse. He's had two concussions. Here, he talks about his experience and what he learned.

  • Knee Injury: Caroline's Story Knee Injury: Caroline's Story

    Caroline loved sports. But when an ongoing knee injury kept her from playing the sports she loved, she discovered new interests. Read her story.

  • Losing Weight: Brandon's Story (Video) Losing Weight: Brandon's Story (Video)

    Brandon, 17, has lost 70 pounds through better eating and exercise. In this video he talks about what inspired him and how he stayed on track.

  • Spinal Muscular Atrophy: Steven's Story (Video) Spinal Muscular Atrophy: Steven's Story (Video)

    Steven was diagnosed with SMA when he was 3. Here's a look at his life today and why he says, "When someone tells you you can't do something, don't be afraid to try something new."

  • Achilles Tendonitis Achilles Tendonitis

    If the tendon just above your heel becomes swollen or irritated due to overuse, it can lead to a painful condition called Achilles tendonitis. Find out how to treat it - and prevent it.

  • Ankle Sprains Ankle Sprains

    A sprained ankle is a very common injury that happens when the ligaments that support the ankle get overly stretched or torn. Find out how to avoid ankle sprains and what to do if you get one.

  • Anterior Cruciate Ligament (ACL) Injuries Anterior Cruciate Ligament (ACL) Injuries

    ACL injuries - which can happen in active and athletic people - happen when excessive pressure is put on the knee joint, resulting in a torn ligament.

  • Athlete's Foot Athlete's Foot

    Although the name athlete's foot sounds funny, if you have this skin infection, you're probably not laughing. The good news is that it is generally easy to treat.

  • Burner (Stinger) Burner (Stinger)

    Burners - also called stingers - usually happen in the neck or shoulder. They take their name from the burning or stinging sensation they cause. Find out how to treat burners - and prevent them.

  • Bursitis Bursitis

    Bursitis, an irritation of the small fluid sacs that provide cushioning in some joints, is often caused by sports-related injuries or repeated use of a particular joint.

  • Casts and Splints Casts and Splints

    This article for teens has tips on taking care of a cast so it keeps working as it should.

  • Clavicle Fracture Clavicle Fracture

    A clavicle fracture, also known as a broken collarbone, is one of the most common types of broken bones. Find out how they can happen - and how to treat and avoid them.

  • Compulsive Exercise Compulsive Exercise

    Compulsive exercise can lead to serious health problems. Lots of people don't know when they've crossed the line from healthy activity to unhealthy addiction. Read about ways to tell.

  • Concussions: Getting Better Concussions: Getting Better

    All body parts take time to heal, even brains.This article for teens has tips on what doctors often recommend to help people heal from a concussion.

  • Concussions: What to Do Concussions: What to Do

    In a concussion, the brain shifts inside the skull. This can cause a sudden - but usually temporary - disruption in a person's ability to function properly and feel well. Here's what to do if you suspect a concussion.

  • Corneal Abrasions Corneal Abrasions

    A corneal abrasion happens when something cuts, scratches, or scrapes the cornea (the clear tissue covering the eye). Most will heal in a couple of days.

  • Dealing With Sports Injuries Dealing With Sports Injuries

    You practiced hard and made sure you wore protective gear, but you still got hurt. Read this article to find out how to take care of sports injuries - and how to avoid getting them.

  • Dehydration Dehydration

    Dehydration is when the amount of water in the body has dropped too low. Read about what causes dehydration, what it does to your body, and how to prevent it.

  • Fainting Fainting

    Fainting is pretty common in teens. The good news is that most of the time it's not a sign of something serious.

  • Female Athlete Triad Female Athlete Triad

    Female athlete triad is a combination of three conditions: disordered eating, amenorrhea (loss of a girl's period), and osteoporosis (a weakening of the bones).

  • Groin Strain Groin Strain

    A groin strain is a tear of one or more of the muscles that help you squeeze your legs together. Find out what to do for groin strains - and why it's important not to go back to sports or other activities too quickly.

  • Hamstring Strain Hamstring Strain

    A hamstring strain happens when one or more of the muscles in the back of the leg gets stretched too far and starts to tear. Find out how to treat hamstring strains in this article for teens.

  • Hernias Hernias

    A hernia is an opening or weakness in the wall of a muscle, tissue, or membrane that normally holds an organ in place. Learning to prevent hernias isn't hard to do - check out these tips.

  • Hip Pointer Hip Pointer

    Most hip pointer injuries can be easily treated and heal in their own time. Find out what to do in this article for teens.

  • Jock Itch Jock Itch

    Jock itch is a pretty common fungal infection of the groin and upper thighs. It is generally easy to treat - and avoid - by following a few simple steps.

  • Jumper's Knee Jumper's Knee

    Jumper's knee is an inflammation or injury of the patellar tendon. Although it can seem minor, it's actually a serious condition that can get worse over time and ultimately require surgery if not treated.

  • Knee Injuries Knee Injuries

    Healthy knees are needed for many activities and sports and getting hurt can mean some time sitting on the sidelines.

  • Medial Collateral Ligament (MCL) Injuries Medial Collateral Ligament (MCL) Injuries

    MCL injuries happen when excessive pressure is put on the knee joint, causing a torn ligament.

  • Medial Epicondylitis Medial Epicondylitis

    Medial epicondylitis is an overuse injury that affects the tendons in the elbow. It's rarely serious, but it does need rest and treatment or it will get worse. Find out what to do.

  • Meniscus Tears Meniscus Tears

    The key to healing meniscus tears is not to get back into play too quickly. Find out what meniscus tears are and how to treat them.

  • Osgood-Schlatter Disease Osgood-Schlatter Disease

    Osgood-Schlatter disease (OSD) is an overuse injury that can cause knee pain in teens, especially during growth spurts. Learn more.

  • Plantar Fasciitis Plantar Fasciitis

    The most obvious symptom of plantar fasciitis is a sharp pain on the bottom of the foot, near the heel. Find out how to tell if it's plantar fascitiis and what you can do in this article for teens.

  • Proximal Biceps Tendonitis Proximal Biceps Tendonitis

    In teens, biceps tendonitis is usually an overuse injury that causes tendons in the upper arm to be swollen or irritated. Most cases heal on their own if you follow a few guidelines from your doctor.

  • Quadriceps Contusion Quadriceps Contusion

    Quadriceps contusions are common in sports that have a lot of direct contact or a chance of collisions or wipeouts. Find out what to do if you get one - and how to avoid them.

  • Repetitive Stress Injuries Repetitive Stress Injuries

    Repetitive stress injuries happen when too much stress is placed on a part of the body, causing problems like swelling, pain, muscle strain, and tissue damage.

  • Runner's Knee Runner's Knee

    Runner's knee is the most common overuse injury among runners, but it can also happen to other athletes who do activities that require a lot of knee bending.

  • Sinding-Larsen-Johansson Syndrome Sinding-Larsen-Johansson Syndrome

    This growth-related injury is more common in teens who play sports that require a lot of running or jumping. Find out why it happens - and what you can do to avoid and treat it.

  • Sports and Concussions Sports and Concussions

    As long as people play sports, there will be concussions from time to time. Find out how to protect yourself and what to do if you get a concussion playing sports.

  • Stress Fractures Stress Fractures

    It's not always easy to tell if you have a stress fracture, and stress fractures can get worse quickly. This article explains how to prevent and treat them.

  • Testicular Injuries Testicular Injuries

    Serious testicular injuries are relatively uncommon, but testicular injury can be painful. Read this to find out what steps you can take to protect yourself from injury.

  • What to Expect When Your Cast Comes Off What to Expect When Your Cast Comes Off

    You probably can't wait to get back to your normal activities, but it takes a while for a limb that's been in a cast to finish healing. Here's what to expect.

  • 5 Facts About Goal Setting 5 Facts About Goal Setting

    Here are 5 practical tips on goal setting that can help make it easier to set and reach goals.

  • Advice for Athletes From a Gold-Medal Coach Advice for Athletes From a Gold-Medal Coach

    Bob Bowman coaches Olympic gold medalist Michael Phelps. He shares his thoughts on improving sports performance in this article for teens.

  • Handling Sports Pressure and Competition Handling Sports Pressure and Competition

    Winning is all that matters when you play sports, right? Not when that means you can't even enjoy the game. Read about how to handle sports pressure and competition.

  • Making a Change in Your Life Making a Change in Your Life

    This interactive feature guides you in setting a goal and coming up with steps to reach it.

  • Motivation and the Power of Not Giving Up Motivation and the Power of Not Giving Up

    Everyone struggles with staying motivated and reaching their goals. Just look at how many people diet, lose weight, and then gain it back again. But it's still possible to stay motivated if you take the right approach.

  • Sportsmanship Sportsmanship

    Some people define good sportsmanship as treating the people that you play with and against as you'd like to be treated yourself. Learn more about what good sportsmanship is all about.

  • The Power of Positive Emotions The Power of Positive Emotions

    Scientists are learning that positive emotions have a powerful effect on our brains and bodies, helping us feel, and act, our best. Let this article help you tap into the power of positive emotions.

  • Yoga: Meditation and Breathing Yoga: Meditation and Breathing

    Breathing and meditation techniques can have subtle but powerful effects on everything from stress to sports performance. Try these four techniques.

  • 5 Ways to Prepare for Your Sports Season 5 Ways to Prepare for Your Sports Season

    How can you get ready to play your best season ever? Read these tips for teen athletes.

  • A Guide to Eating for Sports A Guide to Eating for Sports

    You've prepared for the game in almost every way possible: but now what should you eat? Read about performance foods, nutritional supplements, and more.

  • Are Steroids Worth the Risk? Are Steroids Worth the Risk?

    Will using steroids transform you into the most powerful athlete your coach has ever seen? Read this article to learn the facts on steroid use.

  • Caffeine Caffeine

    Caffeine has probably helped you through long nights of studying or filling out college applications. But how much do you know about caffeine and its side effects?

  • Cold-Weather Sports Cold-Weather Sports

    Don't let the chill of winter turn you into a couch potato! Read this article to learn about some cool winter sports.

  • Connecting With Your Coach Connecting With Your Coach

    Get the most out of your chosen sport by building a strong relationship with your coach.

  • Dynamic Stretching (Video) Dynamic Stretching (Video)

    These videos guide you through 8 dynamic stretches that target different muscles and areas of the body.

  • Energy Drinks and Food Bars: Power or Hype? Energy Drinks and Food Bars: Power or Hype?

    Energy drinks and nutrition bars often make big promises. But when you cut through the hype, what are you really getting? Find out here.

  • Safety Tips: Baseball Safety Tips: Baseball

    Baseball is by no means a dangerous sport. But it can present a very real risk of injuries from things like wild pitches, batted balls, and collisions in the field.

  • Safety Tips: Basketball Safety Tips: Basketball

    It may be fun to play and great exercise, but basketball is also a contact sport, and injuries occur frequently. To help make sure you're doing everything you can to stay safe on the basketball court, follow these safety tips.

  • Safety Tips: Cheerleading Safety Tips: Cheerleading

    Cheerleading today requires considerable athletic ability. The more challenging it gets, the greater the risk of getting hurt. Find out how to avoid injuries.

  • Safety Tips: Fastpitch Softball Safety Tips: Fastpitch Softball

    Softball is a very safe sport, especially slow-pitch. But in fastpitch, things speed up, and that increases the chances of getting hurt. So keep these safety tips in mind.

  • Safety Tips: Field Hockey Safety Tips: Field Hockey

    Field hockey is a contact sport, and injuries are bound to happen. To minimize your risk of injury, follow these safety tips.

  • Safety Tips: Football Safety Tips: Football

    Football is a lot of fun, but since the name of the game is to hit somebody, injuries are very common. To learn how to keep things as safe as possible on the football field, follow these tips.

  • Safety Tips: Golf Safety Tips: Golf

    While it may seem silly to think of golf and danger in the same sentence, injuries can and do happen. To learn how to stay safe on the golf course, take a look at these safety tips.

  • Safety Tips: Gymnastics Safety Tips: Gymnastics

    Gymnastics is a great sport and a fun way to get a muscular, toned body. But, it also presents a very real risk of injury. To keep things safe during practice and competition, follow these tips.

  • Safety Tips: Hockey Safety Tips: Hockey

    As fun as it is, ice hockey carries a very real risk of injury. To find out how to stay as safe as possible, follow these tips.

  • Safety Tips: Inline Skating Safety Tips: Inline Skating

    Inline skating is good exercise and an excellent off-season training program for hockey and skiing. To stay safe while inline skating, take a look at these tips.

  • Safety Tips: Lacrosse Safety Tips: Lacrosse

    When everyone's moving so fast and using sticks to sling a solid rubber ball around, injuries are bound to happen in lacrosse. Here's how to avoid them.

  • Safety Tips: Running Safety Tips: Running

    Injuries can be common, and runners should always be aware of their surroundings. To keep things safe while running, follow these tips.

  • Safety Tips: Skateboarding Safety Tips: Skateboarding

    Skateboarding is undeniably cool, but it's also easy to get hurt. Keep it safe while skateboarding with these safety tips.

  • Safety Tips: Skiing Safety Tips: Skiing

    There's a lot to love about skiing, but it can also present some very real dangers, from frostbite and sunburn to blown knees and head injuries. Follow these tips to stay safe on the slopes.

  • Safety Tips: Sledding Safety Tips: Sledding

    Sledding is a lot of fun, but can also cause injuries, some of them pretty serious. To keep yourself safe while sledding, follow these safety tips.

  • Safety Tips: Snowboarding Safety Tips: Snowboarding

    Snowboarding is a great way to have fun, but it can also present some very real dangers. Follow these safety tips to learn how to stay safe on the slopes.

  • Safety Tips: Soccer Safety Tips: Soccer

    Soccer is easy to learn at a young age, and it's great exercise. But it's also a contact sport, and injuries are bound to happen. To help prevent mishaps, follow these safety tips.

  • Safety Tips: Swimming and Diving Safety Tips: Swimming and Diving

    To keep things as safe as possible for swimming and diving season, follow these tips.

  • Safety Tips: Tennis Safety Tips: Tennis

    Injuries in tennis are rare, but it's good to be aware before you play. To minimize your risk of injury while playing tennis, follow these safety tips.

  • Safety Tips: Volleyball Safety Tips: Volleyball

    Following these tips can help protect you from injuries while playing volleyball.

  • Safety Tips: Wrestling Safety Tips: Wrestling

    In wrestling, injuries are bound to happen sometimes. To keep things as safe as possible, follow these tips.

  • Sports and Exercise Safety Sports and Exercise Safety

    Playing hard doesn't have to mean getting hurt. The best way to ensure a long and injury-free athletic career is to play it safe from the start. Find out how.

  • Sports Physicals Sports Physicals

    Just as professional sports stars need medical care to keep them playing their best, so do student athletes. That's why it's important to get a sports physical.

  • Sports Supplements Sports Supplements

    Sports supplements are products used to enhance athletic performance. Lots of people who want to improve their performance have questions about how supplements work and whether they're safe.

  • Stop Smoking: Your Personal Plan Stop Smoking: Your Personal Plan

    This interactive feature helps you come up with a plan to stop smoking.

  • Strength Training Strength Training

    Is working out with weights safe for teens? The best way to build muscle tone and definition is to combine aerobic and flexibility exercises with the right kind of strength training.

  • Stretching Stretching

    You may have heard mixed things about stretching before working out. Here are the cold, hard facts on warming up, stretching, and cooling down.

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