84. Why do people gain weight? Your body needs food to work and grow, but if you eat more food than your body needs to get those jobs done, it stores the extra food as fat. You can keep your body at a good weight by eating reasonably-sized portions of healthy food and getting plenty of exercise.
www.Kidnetic.com

85. Your heart has a big job: pumping blood through your body 24/7. Help your heart do its job better by getting plenty of aerobic exercise. Aerobic exercise is any kind of activity that makes your body use oxygen, such as swimming, running skating, soccer, and biking.
www.Kidnetic.com

86. Make regular pit stops. Just as a race car needs to stop for gas during a race, your body needs a steady supply of fuel to run right, so stick with regular meal and snack times. Fruit or yogurt makes a quick, healthy snack when you’re on the run.
www.Kidnetic.com

87. Rome wasn’t built in a day, as they say…The expression means that it takes time and patience to get a big job done. Being healthy is a big job, so it’s OK to change your eating and exercise habits just a little at a time. Little changes really add up after a while.

88. Hitting the books too hard? For every hour of homework, take a five minute break to stretch, exercise, play with your pet or simply daydream. You’ll feel better, and come back refreshed.
http://stress.about.com/od/tensiontamers/tp/stressreliefkid.htm

89. Want to live longer? Floss your teeth. New research shows healthy gums may be linked to a healthy heart. Make it a habit when you’re a kid and you won’t think twice about it as an adult.
research.unc.edu/endeavors/win2000/floss.htm

90. See the glass as half-full. Studies show that cheerful people live longer, healthier lives. You’ll also be more popular – everyone likes to be around positive people.
www.mayoclinic.org/news2000-rst/603.html

91. Sunblock: it’s not just for the beach in the summer. Protect your face, neck and hands with sunblock year-round to reduce your risk of skin cancer. The lighter your skin, the more protection you need.
http://www.skincancer.org/prevention/index.php

92. Make like a library and be quiet for at least five minutes a day – it’s harder than you think to shut out the world completely, but your brain and body will thank you for a little down time.

93. A good night’s sleep is an important part of good health. When you don’t get enough sleep, all sorts of things suffer: your patience, memory, judgment, performance and more. So get to bed!
Stress.about.com

94. Exercise your brain as well as your body by learning something new as often as you can. Studies have shown that learning new things boosts the level of a chemical in your brain called dopamine, which makes you feel good.
http://www.thementalfitnesscenter.com/learnsomethingnew.html

95. Crank it up. When your sports practice starts to seem boring or easy, talk to your coach or teacher about new ways to challenge yourself. You’ll stay more interested in what you’re doing and get stronger too.

96. If your fitness goals seem overwhelming to you, try breaking them up into smaller, more manageable pieces. Work on just one goal at a time, if that’s all you can manage, and be proud of yourself for doing it.
http://www.lifeclinic.com/focus/nutrition/physical-fitness.asp

97. Cool water fact: Most of your body is water. If you weigh 90 pounds, about 63 pounds of your total weight is water!
www.Kidnetic.com

98. How does sweat cool you down? Here’s how it works: when you're hot, water comes up through your skin as sweat and evaporates into the air. This evaporation cools down your skin, which cools down your blood, which in turn cools down your whole body.
www.Kidnetic.com

99. Water: drink it up! On an average day, your body loses two to three liters of water just from living. (Two liters is the size of a big soda bottle.) If you’re exercising and sweating, you lose even more water. So drink up throughout the day to keep your body working well.
www.Kidnetic.com

100. Got a headache?  A pounding noggin is one of the signs of dehydration. Be sure to drink 6 – 8 cups of water a day, spread out throughout the day. If it’s hot out or you’re exercising a lot, it’s even more important to drink because you’re losing more water than at other times.
http://headaches.about.com/od/migraineprevention/a/dehydration.htm and http://www.cnn.com/HEALTH/library/NU/00283.html

101. Take that to the bank! Think of your bones as a bank account. The more calcium and exercise you get, the more “deposits” of bone tissue you make in your body. You want your “bone bank account” to be big because your bone mass peaks by your late 20s – and you need to make sure your bones are strong enough by then to support you your whole life.
http://teamnutrition.usda.gov/resources/mpk3_lesson3.pdf and http://www.niams.nih.gov/hi/topics/osteoporosis/kidbones.htm#1