No. 1: Quadruped leg lifts (strengthens entire core and glutes)
Start on the hands and knees, engage your core, and lift one leg off the floor (bent or straight). Pulse up and down a few inches for 30 to 60 seconds, then repeat on the other leg.
No. 2: Clamshells (strengthens gluteus medius)
Lie on your side with knees bent at 90 degrees in front of you. Lift your top knee away from your bottom knee, then lower slowly.
For an increased challenge, lift both feet off the ground while keeping the heels together. Repeat for 30 to 60 seconds per side.
No. 3: Glute bridges (strengthens lower back and glutes)
Lie on your back with knees bent and feet parallel, a few inches from your hips. Engage your abs, and squeeze your glutes to lift your hips toward knee height, then lower.