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With your feet anchored either with a bar/weight or partner, hinge forward with your hands behind your back and the only movement happening at the knee joint. You can start with an exercise ball and progress to going all the way to the floor. this exercise is as many reps as possible.
Up Next in Day 3
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Nordic FLEX.
Kneeling down hinge backwards while maintaining a straight line from your knees up keeping the only movement at the knee joint. This exercise is as many reps as possible.
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Proper Ab Crunches
Low back supported with frog legs focused on lifting the chest into the air. Perform 50x