Lie on your back with your knees bent and feet flat on the floor. Place your hands behind your head or across your chest. Engage your core muscles and lift your upper body off the floor, then lower back down. Aim for 15-20 reps.
Lie on your back with your hands behind your head. Lift your legs off the floor and bend your knees. Bring your right elbow toward your left knee as you extend your right leg straight, then switch sides in a pedaling motion. Do 15-20 reps on each side.
Start in a push-up position with your hands directly under your shoulders. Keep your body in a straight line from head to heels, engage your core, and hold the position for 30 seconds to 1 minute.
Sit on the floor with your knees bent and feet flat. Lean back slightly, engage your core, and twist your torso to the right, then to the left, tapping the floor beside you with each twist. Repeat for 10-15 reps on each side.
Begin in a standing position, then squat down and place your hands on the floor. Jump your feet back into a plank position, perform a push-up, then jump your feet back toward your hands and stand up, jumping into the air. Repeat for 10-15 reps.
Start in a plank position with your hands under your shoulders. Drive your right knee toward your chest, then quickly switch legs, bringing your left knee toward your chest. Continue alternating legs at a fast pace for 30-60 seconds.
Lie on your back with your legs straight. Lift your legs toward the ceiling, keeping them straight or slightly bent at the knees, then lower them back down without touching the floor. Repeat for 10-15 reps.
Start in a plank position on your side, with your elbow directly under your shoulder and your feet stacked or staggered. Lift your hips off the floor, creating a straight line from head to heels. Hold the position for 30 seconds to 1 minute, then switch sides and repeat.