Start in a plank position with your hands shoulder-width apart. Lower your body until your chest nearly touches the floor, then push back up to the starting position.
Hold a plank position for as long as possible, focusing on maintaining proper form and engaging your core muscles.
Begin standing, 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 to your hands.
Start in a plank position, then alternate bringing your knees toward your chest in a running motion. Keep your core engaged and your hips level as you perform the exercise.
Sit on the floor with your knees bent and feet lifted off the ground. Hold a weight or medicine ball in front of your chest, then rotate your torso from side to side.
Lie face down on the floor with your arms extended overhead. Lift your arms, chest, and legs off the ground simultaneously, then lower back down with control.
Lie on your back with your legs straight and together. Lift your legs toward the ceiling, keeping them straight, then slowly lower them back down toward the floor.
Lie on your back with your knees bent and feet flat on the floor. Lift your hips toward the ceiling, squeezing your glutes at the top, then lower back down with control.
Lie on your back with your legs straight and hands under your hips for support. Lift your legs slightly off the ground and alternately kick them up and down in a fluttering motion.
Lie on your back with your knees bent and feet lifted off the floor. Contract your lower abs to lift your hips off the ground, bringing your knees toward your chest.