Get into a push-up position, but rest on your forearms instead of your hands. Keep your body in a straight line from head to toes.
Lie on your back with hands behind your head and legs lifted. Bring your right elbow towards your left knee while extending the right leg, then switch sides.
Lie flat on your back with legs extended. Lift your legs until they form a 90-degree angle with your body, then slowly lower them without touching the floor.
Sit on the floor with knees bent and feet lifted off the ground. Lean back slightly and rotate your torso side to side, touching the floor beside you each time.
Start in a plank position and drive one knee towards your chest, then quickly switch legs in a running motion.