Works core, glutes, and hamstrings
Sit on the floor with your knees bent, feet hip-width apart and flat on the floor. Grab the backs of your thighs and suck in your navel so your torso forms a C. Keeping your back rounded, slowly roll back as low as you can with your feet planted on the floor. Take three deep breaths. Return to start. Repeat twice without resting.
Works core, shoulders, back, glutes, and legs
Lie on your back. Bring your knees toward your chest and grab your shins. Brace your abs. As you lift your head, neck, and shoulders off the floor, extend your legs. Hold them about 12 inches off the floor and straighten your arms over your head with your palms up. Bring your knees back up to your chest and grab your legs again. That's 1 rep; do 8.
Side Leg Circles
Works core and inner and outer thighs
Lie on your right side with your right upper arm on the floor and your head resting on your right hand. With knees straight, bend at your hips so your legs and torso form a slight angle. Raise your left leg 6 to 8 inches and make 8 small forward circles from the hip, raising the leg higher with each one. From the highest point, make 8 more small circles in the other direction as you lower the leg to start. That's 1 rep. Do 3 and then repeat on the other side.
Works shoulders, obliques, back, glutes, and legs
Sit with your legs extended in front of you, knees straight and toes pointing up. Extend your arms to the sides at shoulder height, palms down. Twist your upper body as far as you can to the left without compromising your posture or shifting your hips or legs. Pulse twice, reaching farther to the left each time. Return to center and repeat the move to the right. That's 1 rep; do 5. Make it harder Hold a 2-or 3-pound weight in each hand.