Fitness at any age can be but I suggest 16 years old or after the best in the practice, the age of a little bit can also practice but the intensity can not be too big, otherwise it will affect the

Fitness at any age can be but I suggest 16 years old or after the best in the practice, the age of a little bit can also practice but the intensity can not be too big, otherwise it will affect the development of the 16 years old can be fitness but it is recommended that the amount of the first small point can be slowly added after the group to complete the group, the interval between each group do not take too long, the number of groups a little bit more. Each group try to do exhaustion it. Time is the best proof, of course, but also to ensure that the diet and adequate sleep, go on it? I just finished my workout and it's 2:32am now