Before puberty, kids are able to get stronger even though they're not likely to develop visibly larger muscles. ... A key is to make sure kids are able to perform a motion or exercise with proper form before adding any weight. Strength workouts can be 20 to 30 minutes, two or three days per week.

Does working out before puberty stunt your growth?

One of the biggest myths about weight lifting is that it stunts your growth. No studies have ever been shown that lifting weights stunts or inhibits growth. But, as with any exercise program, if you do too much too soon, physical problems can occur no matter how old the person doing the exercise is.

Is 12 a good age to start working out?

From what I've observed, 12 or 13 years old is the appropriate age to start a proper strength and conditioning program. ... Even when athletes are 12 or 13 years old, they should still meet a few other prerequisites before they start a strength and conditioning program.