176This entry was posted in Daily 20-Min Workouts on August 4, 2015 by OPEN GYM Fitness Pyramid 3-6-9-12-15-12-9-6-3 TRX Squat Jumps Kettlebell Swings Plank Jacks Hanging Knee Raises Do 3 of each exercise. Then 6 of each exercise. Then 9. And so forth all the way up to 15 and back down.