"Aren't they a little young for that?" This is a question I used to hear regularly from parents when I'd recommend strength training for the kids I worked with, whose ages ranged from 6 to 18 years ...

Natalie Rose, a U.K.-based certified personal trainer, and barre and Pilates instructor, created the 3-2-8 program. She explains the basics on her website, Bodybybarre, where she also has a 12-week ...