Crunches: A classic abs exercise. Lay on your back with your feet on the ground and knees bent. Lift your upper body off the ground, engaging your core.

Planks: Start in a push-up position but rest on your forearms rather than your hands. Keep your body in a straight line from head to feet and hold the position.

Russian Twists: Sit on the floor with your knees bent, pull your abs to your spine, and lean back a few inches while keeping your back straight. Hold your hands in front of you and twist your torso to the right, then to the left to complete one rep.

Leg Raises: Lie flat on your back on a bench or the floor. Keep your hands under your glutes and lift your legs straight up until your body forms an L shape. Lower your legs back down without letting them touch the bench/floor.

Mountain Climbers: Get into a high plank position. Bring your right knee up towards the chest, then switch and bring the left knee up towards the chest. Continue to alternate rapidly.

Bicycle Crunches: Lie on your back, bring your legs to a tabletop position, and place your hands behind your head. Bring your right elbow to your left knee, straighten your right leg, and then switch sides.

Ab Wheel Rollouts: Kneel on the floor and hold an ab wheel beneath your shoulders. Carefully roll forward, stretching your body into a straight line. Roll back after a pause.

Cable Crunches: Kneel in front of a cable machine with a rope attached. Hold the rope with your hands at the sides of your face. Bend at your waist to curl your body towards your legs.
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