Prayer Crunch: Lie on your back, feet flat on the ground and knees bent. Curl your chin towards your chest, lift shoulders off the ground, and reach hands forward.
Side Crunch: Lie on your back, feet flat on the ground and knees bent. Extend arms towards feet, lift shoulders off the ground, and tap each foot with alternate hands.
Reverse Crunch: Lie on your back, raise legs with thighs vertical and knees bent. Draw knees towards chest using abs, lift hips off the ground, and lower slowly.
Hollow Hold: Lie on your back, arms extended behind your head. Press lower back into the floor, raise arms, shoulders, and legs off the ground, and hold.
Knees to Elbow: Start in the top press-up position. Lift one leg, bend knee to bring it towards the chest until knee and elbow touch, then return to starting position.
Scissor Kick: Lie on your back with knees bent towards chest and hands under glutes. Lift shoulder blades off the ground, extend legs, and criss-cross feet.
Russian Twist: Sit on the ground, lean back at a 45° angle with raised feet. Link hands in front of your chest and rotate torso from side to side.