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Plank: Start in a push-up position but instead of lowering your body to the ground, hold your body in a straight line, supported by your forearms and toes.
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Side Plank: Lie on your side with your feet together and prop yourself up on one elbow. Raise your hips off the ground so that your body forms a straight line.
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Russian Twist: Sit on the floor with your knees bent and feet flat on the ground. Hold your hands together and twist your torso from side to side, keeping your feet on the ground.
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Bicycle Crunches: Lie on your back with your hands behind your head and your knees bent. Alternately bring your elbow and knee together, twisting your torso as you do so.
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Leg Raises: Lie on your back with your hands under your lower back for support. Raise your legs up until they are straight and then lower them back down.
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Mountain Climbers: Start in a push-up position, with your hands under your shoulders. Bring one knee up towards your chest, then back to starting position and repeat with the other knee.
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Reverse Crunches: Lie on your back with your knees bent and hands by your side. Use your abs to lift your hips off the ground, bringing your knees towards your chest.
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Supermans: Lie face down on the floor with your arms and legs extended. Simultaneously raise your arms, legs and chest off the ground, then lower them back down.
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Seated Russian Twist: Sit on the floor with your knees bent and feet flat on the ground. Hold your hands together and twist your torso from side to side, keeping your feet on the ground.
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Boats: Sit on the floor with your knees bent and feet off the ground. Lean back slightly, lifting your feet and extending your arms forward, forming a V shape with your body.
