I set off to work shoulders and core today. So, to that end, I thought, planks! We did plenty of this, but by adding some big, dramatic leg movements, requiring an equally dramatic activation of the gluteus medius.  I won’t pretend that the big arc I’ll ask to make with your legs is easy; it is not. It requires a lot of strength, but you’ll have more success if you bring your attention to your booty and the muscles that make activation possible. Good luck – please excuse the technical difficulties that happen about 12 minutes in.