9. Flutter kicks
Don’t let your feet touch the ground and ensure your abs are tight throughout. Your goal is 3 sets and for each set you’ve got to complete 30-second flutter kicks with 30-second rest.
1. Lie on your back with your arms by your sides, palms face down.
2. Extend your legs fully out and lift your heels about 6 inches off the floor.
3. Make small, rapid up and down scissor-like motions with your legs.