Climb uphill to work the gluteus maximus. Hill-climbing uses the same motion as squats and lunges, and the added intensity also raises your heart rate. Look for hilly trails or areas with stairs or natural rock formations suitable for climbing.
Lateral-walk to work the gluteus minimus and gluteus medius muscles. Lengthen your stride to slightly longer than normal. As you step forward, swing your leg out to the side and plant your foot on the ground. Bend your front knee, push off and bring your other foot up to meet your forward foot. Step out to the other side.