Bodysaw planks are a brutal anti-extension core stability exercise. Begin on your forearms in a plank with each foot on a Valslide. Exhale and activate your glutes and anterior core to achieve a neutral spine position. Maintain this position as you push yourself backwards with your forearms. Extend your body as far as you can WHILE STILL MAINTAINING A NEUTRAL SPINE POSITION. Reverse directions and pull yourself back to the starting position. Repeat for 3-4 sets of 8-12 reps. The key is to maintain the neutral spine position throughout the movement. Give this one a try if you are looking to take your core strength and stability to a new level.