Start in a push-up position, with your body forming a straight line from head to heels. Keep your abs engaged and hold this position for as long as you can, aiming for at least 30 seconds to start.
Sit on the floor with your knees bent and feet flat. Lean back slightly and lift your feet off the floor, balancing on your tailbone. Hold a weight or medicine ball with both hands and twist your torso to the right, then to the left
Lie on your back with your legs straight and arms by your sides. Lift your legs off the floor until they are perpendicular to the ground, keeping them straight. Slowly lower them back down without letting them
Lie on your back with your hands behind your head and legs lifted, knees bent at a 90-degree angle. Bring your right elbow towards your left knee while straightening your right leg. Switch sides, bringing your left elbow
Lie on your back with your legs extended and arms by your sides. Lift your legs a few inches off the ground and alternate kicking them up and down in a quick, fluttering motion while keeping your core engaged.
Start in a plank position with your wrists directly under your shoulders. Bring your right knee towards your chest, then quickly switch legs, bringing your left knee towards your chest.
Lie on your back with your arms extended towards the ceiling and legs lifted, knees bent at a 90-degree angle. Lower your right arm and left leg towards the floor while keeping your lower back pressed
Lie on your back with your knees bent and feet lifted off the floor. Place your hands by your sides or under your hips for support. Engage your core and lift your hips off the ground, bringing your knees towards your chest.