Start in a push-up position, but with your weight on your forearms instead of your hands. Keep your body in a straight line from head to heels.
Sit on the floor with your knees bent and feet flat. Lean back slightly, keeping your back straight, and lift your feet off the ground.
Slowly lower them back down without letting them touch the floor, then repeat.
Alternate bringing your left elbow towards your right knee while straightening your left leg, then switch sides in a pedaling motion.
Lie on your back with your legs straight. Lift your legs a few inches off the ground and alternate kicking them up and down in a fluttering motion.
Start in a plank position with your wrists under your shoulders. Keeping your core engaged, alternate bringing your knees towards your chest in a running motion.
Lie on your back with your arms extended towards the ceiling and your legs lifted, knees bent at a 90-degree angle.
Lie on your back with your knees bent and feet flat on the floor. Lift your feet off the ground and bring your knees towards your chest.
Start in a plank position on your hands. Keeping your core stable, lift one hand off the ground and tap the opposite shoulder.
Lie on your back with your arms extended overhead and your legs straight. Lift your head, shoulders, and feet off the ground, creating a "banana" shape with your body.