Anything you want to do..but if you mean for exercise then you could always do sports. You can run or swim or ride a bike. Lifting weights is about the only way you are going to get bigger though (i mean muscle mass, not skeletal size)
Yes. A lot of boys do weights before girls. Some girls don't even do weights. A lot of girls do weights before boys as well. Some boys don't do weights either.
Absolutely not, females are perfectly capable of lifting weights.
i started when i was 8 and im a girl. but i dont think really until 12. 10 for boys
Well it depends on the person but usually not until they are 12. It still depends on the person, most boys start when they are11 though.
It doesn't. It's a commonly held myth. Normal, properly performed resistance exercise will not stunt growth in young people. Younger individuals should be carefully supervised when weight lifting, especially when attempting more complicated lifts with heavier weights. It's possible an injury resulting from improper use of weights could stunt growth, but it shouldn't be an issue if proper supervision and training is given.
if the boys parents are okay with it and the boy has a sound health then yes a thirteen year old boy can practice taijutsu.
Boys and girls become teenagers when they reach their 13th birthday. (thirteen)
no
The cast of The Thirteen Most Beautiful Boys - 1964 includes: Fred Herko Dennis Hopper Gerard Malanga Billy Name Bruce Rudo
9 inches if off weights, depends on weight aswell, on weights over 10
2 minutes - 30 minutes
it orginated in Europe when two boys were cleaning and were "competing" to lift the heaviest things. Thence weight lifting was born.