23This entry was posted in Daily 20-Min Workouts on February 2, 2015 by OPEN GYM Fitness Row 1600m On the Minute For 12 Minutes: Min 1: 45 Second Plank Min 2: 25 GHD Sit Ups Min 3: 45 Second Tuck Hold (on parallettes) Min 4: 25 Hanging Knee Raises Repeat. Repeat.