94This entry was posted in Daily 20-Min Workouts on April 28, 2015 by OPEN GYM Fitness On the Minute For 20 Minutes: Min 1: 7 Pull Ups Min 2: 15 Ball Slams Min 3: 100ft Jacob’s Ladder (or as far as you can get in that minute) Min 4: 45 Second Plank Repeat.