Popsugar Fitness Fitness Tips Exercises Using Towels Holy Intense Ab Burn! Carve Your Core With Just These 3 Moves June 23, 2018 by Jenny Sugar View On One Page Photo 3 of 5 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 3 Plank to Pike Begin in plank position with two towels under the balls of your feet. Slowly bend both knees in toward the chest while keeping the arms straight, shoulders over the wrists, and maintain a flat, tabletop back. After doing 10 reps, draw both knees to the right foot for five reps and then to the left foot for five. Repeat this 20-rep sequence two more times. Previous Next Start Slideshow Fitness TipsWorkoutsAb Exercises