Get into a push-up position with your arms straight. Balance on your toes and forearms, keeping your body in a straight line.
Lie flat on your back with your legs straight and arms at your sides. Lift your legs up towards the ceiling, keeping them straight.
Lie flat on your back and place your hands behind your head. Lift your legs off the ground and bring your right elbow and left knee towards each other while extending your right leg.
Sit on the floor with your knees bent and feet flat. Lean back slightly and lift your feet off the ground.
Start in a plank position. Bring your right knee towards your chest, then quickly switch and bring your left knee in.
Lie on your back with your knees bent and feet flat on the floor. Lift your legs so your thighs are perpendicular to the ground.
Lie flat on your back with your hands under your hips for support. Lift your legs a few inches off the ground and alternate kicking them up and down.
Start in a standing position. Drop into a squat position and place your hands on the ground.