Plank: Start in a push-up position, then lower yourself onto your forearms. Keep your body in a straight line from head to heels, engaging your core muscles.
Russian Twists: Sit on the floor with your knees bent and feet flat on the ground. Lean back slightly, keeping your back straight, and lift your feet off the ground.
Bicycle Crunches: Lie on your back with your hands behind your head and legs raised, knees bent at a 90-degree angle. Bring your right elbow towards your left knee while straightening your right leg.
Mountain Climbers: Start in a push-up position with your hands directly under your shoulders. Keep your core engaged as you alternate bringing your knees towards your chest in a running motion.
Side Plank: Lie on your side with your legs straight and your elbow directly under your shoulder. Lift your hips off the ground, keeping your body in a straight line from head to heels.
Flutter Kicks: Lie on your back with your hands under your hips and legs extended straight out. Lift your legs off the ground a few inches and alternate kicking them up and down in a quick, fluttering motion.
Standing Oblique Crunches: Stand with your feet shoulder-width apart and your hands behind your head. Lean to the right, bringing your right elbow towards your right hip while lifting your left knee towards your left elbow.
Deadlifts: Hold a pair of dumbbells or a barbell in front of your thighs with your feet hip-width apart. Keeping your back straight, hinge at the hips and lower the weights towards the ground until you feel a stretch in your hamstrings.