Want abs like Bruce Lee? Watch Jared demonstrate Lee's famous Dragon Flag core exercise using the MoveStrong Stall Bars.  Start by hands grasping and bracing forearms against rungs that allow for a straight arm position, contract lats, and tighten core as you raise lower body.  Begin with the first progression and only proceed to the next based on your ability to maintain strict form for multiple reps in a slow controlled manner. Top position of each should finish on upper back and shoulders, NOT head or neck causing strain. Dragon Flags work all the core stabilizers and because it requires a controlled movement, it builds strength more quickly than isolated core exercises.