Plank with Alternating Leg Lift - this one is awesome too. Do a plank workout and when you feel done and exhausted keep going for another minute and add a few of these leg lifts at the end. You can FEEL it!
Tone Your Butt With Plank Booty Leg Lifts: If youre looking to tone up your rear, but youre tired of doing squats, heres a great exercise that targets your booty and the back of your thighs beautifully. Grab an exercise ball and give this a try.