You don't need leg raises or heavy weights to strengthen your core and hips, just try the dragon flag calisthenics exercise.

This expertly designed 20-minute AMRAP leg workout transforms your lower body with minimal equipment while maximizing fat ...

And no ordinary variation, either. A reverse crunch, but with added leg lift (or hip raise). Variety upon variety. Ain’t life grand? What is the reverse crunch with a leg lift? The crunch is an ...