Q: I’ve been training for about 20 years now (I’m 44), and I am getting my 14-year-old son into it. He’s been working out about four months, breaking in, but I still do NOT want him to go “heavy.” I have him using your 4X method, which is great at his stage. I was thinking about the Progressive-Speed 4X version as well, specifically the speed set in order to help build the power fibers. Is that a good idea at his age, or should he use with caution?

A: First, what you have him doing now is perfect. Moderate-weight growth-threshold 4X is fantastic for young teens getting into lifting. Heavy weights may damage young joints early on, so it’s a good idea to get neophytes gradually acclimated… [Read more…]