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Often considered the "king" of ab exercises, the Hardstyle version requires the legs to remain perfectly straight with the toes pointing toward the bar, using the lats and abs in unison. The Ab Wheel Rollout:

Unlike a momentum-based sit-up, this version uses a "j-curve" spine and internal tension to lift the body slowly, segment by segment. The Hanging Leg Raise:

Instead of hundreds of crunches, the program recommends 3–5 sets of 3–5 reps of high-tension exercises.