Lie flat on your back with arms extended, holding a barbell above your chest. Raise legs to an L-shaped position. Without touching the floor, lower legs to each side and back up, keeping arms straight.
Stand with knees bent, lift a medicine ball over your head, then slam it to the ground as you bend forwards at the waist. Catch and repeat to engage core and shoulders.
Lie on your side, left arm extended, right arm bent to head, right leg on top of left. Contract obliques to bring right elbow to left leg, then switch sides.
Lie on a bench, hands holding bench behind head, knees up to chest, kick out to ceiling, raising body with shoulders on bench. Slowly lower to feel burn in abs and lower back.
Set cable machine high, stand side-on, grab handle, feet shoulder-width apart. Pull handle down and across body, rotating torso, then return to start.
Lie flat, arms extended behind head, feet off ground. Pull knees to chest, lift backside, lift arms over head as you perform a crunch.
Lie with knees bent, hold sandbag above with extended arms, crunch forwards into a V shape, then lower down.
Hang from pull-up bar, raise straight legs until perpendicular to torso, then lower back down.
Lie on stomach, hands on head, raise torso and twist chest from side to side to target abs and combat stiffness in back.
Sit with legs straight, hands up above head, raise legs to form dish shape, rock back and forth to strengthen core.