How much is too much when it comes to core work? That’s a tricky answer. You’d be hard-pressed to do a workout that doesn’t involve your core in some way. That’s because the core is your body’s powerhouse. Your “core” includes the muscles that lie below your chest and above your knees (abdominals, back, quads and hamstrings). Your core allows you to balance and execute intense cardio and strength movements. Many people tend to focus on just the abs. That’s a mistake!