Iron whip is a trick created Sage. One of the earliest tricks to utilize slack string, Iron Whip is dependent on maintaining even string tension. 1. * Start by throwing a trapeze. 2. * Make an open loop using the string from the trapeze. 3. * Pop the yo-yo up towards yourself while holding the open loop. 4. * Whip the loop down into the gap of the yo-yo. 5. * You will be back in trapeze. 6. * Catch the yo-yo!