Jim Dreeben has always been active, but it wasn't until he was in his 80s that he took up CrossFit. Dreeben, a retiree in ...
Push hard away from the flywheel with your legs. Keep your arms straight until your legs are extended, then lean back ...
The YouTube channel Altair CrossFit shows how to do hollow rock correctly to maximize its benefits on the core. 5. Push-Ups: ...