The Window Washer exercise works your abs, hips, butt and thighs.
This is a wonderful full body workout by focusing on your core. You're gonna set up into the perfect plank. Wrist underneath shoulders, navel to spine. You crack the legs with the [unk] bone under. You're gonna use your lower abs and your oblique to lift the leg up off the floor, have to the side and move back to plank. And again, breathe engaging your lower abs. Use your core to lift that leg. Tap and then get back to plank, making sure your elbows are slightly bent but towards your waste. Tap the foot and bring it down.