Infomercials are right about one thing: Exercise devices can put you on the fast track to a six-pack. But the best ones don’t go by names like Ab Rocket or Torso Tiger, and you won’t see them on late-night TV. They’re already in your gym, says David Jack, general manager of Competitive Athlete Training Zone in Acton, Massachusetts. Add these four to your ab routine to accelerate your gains.

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