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Start on all fours. Extend opposite arm and leg simultaneously. Hold and then switch. Primary muscles worked: Rectus Abdominis, Transverse Abdominis, and Erector Spinae.

Hang from a pull-up bar with straight arms. Raise your legs in front of you while keeping them straight. Primary muscles worked: Rectus Abdominis and Hip Flexors.

Lie on your side propped up on an elbow and feet stacked. Lift your hips off the ground, forming a straight line. Primary muscles worked: Obliques and Quadratus Lumborum.

Lie face down, then lift your body off the ground with your forearms and toes. Keep your body straight. Primary muscles worked: Rectus Abdominis, Transverse Abdominis, and Obliques.

Lie on your back and lift your legs. Use your core to roll your pelvis backwards and lift your hips off the floor. Primary muscles worked: Rectus Abdominis and Transverse Abdominis.

Lie on your back with hands behind your head and legs raised. Alternate touching your elbow to the opposite knee. Primary muscles worked: Rectus Abdominis and Obliques.

Sit on the ground with knees bent, lean back slightly. Twist your torso side to side. Hold weight for added difficulty. Primary muscles worked: Obliques and Rectus Abdominis.

Sit on a Swiss ball and roll down until your lower back is supported. Crunch your torso upwards. Primary muscles worked: Rectus Abdominis.

Stand perpendicular to a cable machine. Hold the handle against your chest and press it straight out. Resist rotation. Primary muscles worked: Obliques and Transverse Abdominis.

Start in a push-up position. Alternate driving your knees towards your chest at a rapid pace. Primary muscles worked: Rectus Abdominis, Obliques, and Hip Flexors.

Lie on your back holding a kettlebell above you. Stand up while keeping the kettlebell overhead. Primary muscles worked: Rectus Abdominis, Transverse Abdominis, and Obliques.

Lie on a bench and grip it beside your head. Lift your body off the bench in a straight line from shoulders to toes, then lower back down. Primary muscles worked: Rectus Abdominis and Obliques.

Start in a plank position with your feet on a Swiss ball. Pull the ball towards your hands, raising your hips up to form a V shape. Primary muscles worked: Rectus Abdominis and Transverse Abdominis.

Kneel in front of a cable machine, hold the rope attachment by your head. Crunch down towards your knees. Primary muscles worked: Rectus Abdominis.

Begin in a seated position with your knees tucked. Roll back onto your shoulder blades and then return to the starting position. Primary muscles worked: Rectus Abdominis.

Lie on your back with arms extended towards the ceiling and legs raised and bent at 90 degrees. Alternate extending opposite arm and leg. Primary muscles worked: Rectus Abdominis and Transverse Abdominis.

Lie on your back with your legs extended. Lift your heels and kick your feet up and down in a small scissor-like motion. Primary muscles worked: Rectus Abdominis and Hip Flexors.

Kneel and hold an ab wheel. Roll the wheel out as far as you can while keeping your back flat, then roll back. Primary muscles worked: Rectus Abdominis and Transverse Abdominis.

Start in a plank with your feet on a stability ball. Pull your knees towards your chest, rolling the ball forward. Primary muscles worked: Rectus Abdominis and Transverse Abdominis.