As a child or teenager who are the most important persons in your life? Your parents, right?
They have a tough job to do being a parent - listen to them and try do the best you can for yourself and them too! They want you to be healthy and happy just like you want to be as well.
Also see the following fun sites for colour drawings and games you can play while all learning about your health and the environment around you.
This is the SmartKids online links for safe internet and web-based activities - show your Mum and Dad this site too, as it teaches you how to be use the internet safely and in a healthy way.
Remember to get up from playing the computer or watching the TV every 15 mins and give your body a gentle stretch and your arms and legs a shake or two then have a break for a drink of water.
Try not to watch TV or play computer games more than 2 hrs a day to keep you healthy!