Elite bodybuilder says hack squats are his go-to move for a leaner waist and bulking up leg muscles

Erin Banks said he's seen major leg muscle gains by incorporating hack squats into his lower body workouts to work his quads instead of his core.

1 full-body exercise that's more effective than burpees for building core and leg muscle, according to a trainer

Instead of burpees, do kettlebell swings for a full-body workout that builds muscle in your legs and core, improves stamina, and torches calories.