Teenage years best to start any fitness program, you have to worry about studies only . Youdo not have to worry about any health problems, plus your gonna look better when you're an adult to others!

First let's blast a myth regarding teenage bodybuilding.

Bodybuilding stunts growth - This is one of the most prevalent myths regarding teenage bodybuilding.

The simple fact is that bodybuilding won't ever mess with your growth provided the following:

1) Start bodybuilding only after you reach 13. Before this your still in a growing phase and your bones are too tender to support the heavy training. Before 13 you should only do bodyweight exercises like push ups and dips. They wont make you look big but make you look fit.

2) Don't perform compound movements like Squats and Deadlifts before you grow to at least 16. These things require lot of execution techniques and if you do them wrong you could injure yourself badly. Still if you do want to do them remember never to go too heavy.

3) NEVER take testosterone supplements before you're an adult. Your growing stops once your growth plates close up. As a teenager you already have loads of testosterone in your body, if you intake more testosterone supplements, it will result in your growth plates closing up leading to stunted growth.

It's been seen that 2 out of ever 3 individuals stop training within 2 months and they have loads of excuses like stunted growth and 'bad genetics'. They say that, no matter how much they train they won't gain. Training for just 2 months won't change you into an Arnold.

For the first month do bodyweight exercises like push ups and dips. Also do cardio to increase your stamina. If you are overweight first try cutting down on your fat and only then start bodybuilding. Remember, you can't lose fat and gain muscle at the same time.

To begin training you need to know the basics of muscle development. Muscle respond to the type of work they are accustomed to. When a person lifts heavy weights for short time regularly , his muscles grow thicker and larger to keep up with the amount of work being done. This is where nutrition comes in, if you don't eat enough and just believe in lifting you are gonna get no where. Training without proper nutrition yields zero results. Also make sure your getting at least 8 hours of sleep everyday because your muscles grow only when you sleep and not when you're in the gym.

As a beginner, train 3 times a week and have a full body workout, later on though you can switch to a split routine in which you train specific muscles on specific day. You should train all the muscles in your body and not just one or two to avoid muscle imbalances. Keep your workout time limited to 60 minutes.

Don't expect your physique to change overnight. The bodybuilders you see have been probably training for many years. You can't expect to be like them within months so set realistic goals and achieve them rather than setting impossible goals and failing.

Stay dedicated and hope for the best.