Sit on the floor with your knees bent and feet elevated. Hold a weight (dumbbell, kettlebell, or plate) with both hands. Lean back slightly and twist your torso to the right.
Keeping your hips stationary, contract your abs to curl your torso towards your knees. Slowly return to the starting position and repeat.
Secure your feet in a decline bench and hold a weight plate against your chest. Perform sit-ups by curling your torso towards your thighs and then lowering back down with control.
Keep your legs straight and raise them towards the ceiling while keeping your lower back pressed into the floor.
Keeping your core engaged, row one weight up towards your hip while stabilizing with the opposite arm. Alternate sides.
Alternate bringing your right elbow towards your left knee while extending your right leg, then switch sides in a pedaling motion.
Rotate your torso downwards and thread the weight under your body, then reverse the movement to return to the starting position. Switch sides and repeat.
Lean back until your lower back is supported by the ball, then perform crunches by contracting your abs to lift your torso towards the ceiling.
Curl your knees towards your chest, lifting your hips off the floor, then slowly lower them back down.
Hold the handle with both hands and rotate your torso away from the machine, pulling the handle down diagonally across your body. Control the movement back to the starting position.