What's an effective exercise for toning your butt?

Squats and lunges: Good nutrition including protein. Resistance traing(weight lifting), leg press, knee extensions, hamstrings curls, squats and lunges.

A Better Butt: Agree w dr. Giannini. Exercises that will work your buttocks include: lunges, squats, dumbbell squats, step ups, toe taps, plie, squats with kickbacks, hip extensions, one legged dead-lifts and the gamut of aerobic exercises (running, swimming, bicycling, kickboxing, walking). A trainer at the gym can teach you more great exercises to tone your butt.