Buns of steel

Jillian Michaels, trainer extraordinaire and new SELF contributor, also thinks jumping lunges are a fantastic firmer. "They just blast the heck out of your glutes while working hamstrings and other muscles in the legs." Try this sequence one to three times a week after your usual cardio plan. Quickly do one set of the indicated reps of each move; rest 90 seconds. Repeat up to two more times.
MOVE 1: 20 squats
MOVE 2: 20 lunges, alternating legs
MOVE 3: 20 jumping squats (in a fluid movement: squat, jump, squat)
MOVE 4: 20 jumping lunges (lunge forward with right leg and jump high. While in the air, switch legs and land with the left leg in front. Continue, alternating legs.

I will give it a try and let you know what happens :)

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Now try doing the squat, jump, squat on a step with 2-3 height under the step :)  Your butt will be sore for days :)