Here's another tush-toning move for you!!
How to: Start off on all fours with one leg extended out (slightly above hip height with your foot pointed). Your goal is to pulse the leg, so it is a really small movement focusing on your glutes. Keep that lifting leg off the floor for the entire time.
Too easy? Combine the move with a push up to work the upper body muscles.
Now you: Go for 3 sets of 12-15 repetitions