Planks are a great way to build strength and hardness in the mid section. If you want a sexy flat stomach with rock hard abs you NEED to build up your plank and hit it from all angles so you also have
Five Minute Plank Workout /works: Abs, chest, glutes, lower back, core. I've never sweat so much in my life as when i'm planking!
Benefits of a Salt Water Flush, Plus a Homemade Recipe - Dr. Axe/// this absolutely works!
5 exercises that help you build up the gluteus minimus, gluteus medius, and gluteus maximus.