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Yoga plank position: holding yourself up face down and balancing steady on your forearms and raised toes
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Reverse crunches: lying on your back, bend your knees and pull up towards your chest and then extend them high up into the air while lifting hips and buttocks off the floor
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McGill curl up: lie flat on your back with one knee bent up and one leg flat, then slowly raise just your head and shoulders above the ground, hold for a few seconds, then release
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Bridge: lie on your back with both knees bent and feet flat on the floor, then slowly raise hips upwards, hold, and gradually lower down
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“Bird dog” exercise: start on the ground on all fours and then slowly extend the right arm out straight along with the left leg behind you, steady, and hold your balance for several seconds, then lower back to all fours and repeat with the alternating side