Start in a push-up position but with your weight on your forearms. Keep your body in a straight line from head to heels, engage your core, and hold the position for as long as you can.
Begin in a push-up position. Alternate bringing your knees in towards your chest, as if you're "climbing" in place. Keep your core engaged and maintain a steady pace.
Sit on the ground with your knees bent and your feet flat. Lean back slightly and lift your feet off the ground. Hold your hands together in front of you and twist your torso to the right, then to the left, tapping your hands on the floor on each side.
Lie flat on your back with your legs straight and your arms by your sides. Lift your legs up towards the ceiling, keeping them straight, then lower them back down without letting them touch the ground.
Lie on your back with your hands behind your head and your knees bent. Lift your shoulder blades off the ground and bring your right elbow towards your left knee, then switch sides in a pedaling motion.
Lie on your back with your hands under your hips and your legs straight. Lift your legs off the ground a few inches and alternate kicking them up and down in a fluttering motion.
Start in a standing position, then squat down and place your hands on the ground. Jump your feet back into a plank position, do a push-up, jump your feet back in, and explosively jump up.
Stand in place and lift your knees up towards your chest, alternating between legs. Aim for a brisk pace, engaging your core and pumping your arms for extra intensity.