Lie on your back with your knees bent and feet flat on the floor. Cross your arms over your chest or place your hands behind your head.
Engage your core muscles and lift your upper body off the floor, bringing your chest towards your knees. Lower your body back down to the starting position with control.
Start in the same position as the basic sit-up. Lift your upper body off the ground and twist your torso to the right, bringing your left elbow towards your right knee.
Return to the center and twist to the left, bringing your right elbow towards your left knee. This exercise targets the obliques, helping to define the waistline.
Lie on your back with your legs extended vertically and your feet together. Place your hands by your sides or under your hips for support.
Lift your hips off the ground, curling your lower back and raising your legs towards the ceiling. Lower your legs back down without letting them touch the ground.
Lie on your back with your hands behind your head and your legs lifted off the ground. Bring your right elbow towards your left knee while simultaneously extending your right leg straight out.
Switch sides, bringing your left elbow towards your right knee and extending your left leg. Keep a bicycling motion while engaging your core.
Lie on your back with your hands by your sides or under your hips. Lift your legs off the ground, keeping them straight. Lower your legs down towards the floor without touching it and then raise them back up.
Start in a plank position with your forearms on the ground and your body in a straight line. Lift your right hand and place it on the ground under your right shoulder.
Push up onto your right hand, then your left hand, coming into a high plank position. Reverse the movement, lowering onto your right forearm and then your left forearm.
Begin in a side plank position, resting on your forearm with your body in a straight line. Lower your hip down towards the ground and then lift it back up.
Sit on the ground with your knees bent and feet flat. Lean back slightly, keeping your back straight, and lift your feet off the ground. Balance on your sit bones and extend your legs while lifting your upper body towards your legs, forming a V shape.
Lie on your back with your hands under your hips and your legs extended. Lift your heels slightly off the ground and alternate kicking your legs up and down in a fluttering motion.