Developed for world champion kettlebell lifter Valery Fedorenko, this app teaches overhead stability and safety to lifters of all skill levels.Simply stabilize a weight over your head until you get the green light. It's that easy! Watch in amazement as this app tirelessly drills the skill of fixation into your body.THIS APP REQUIRES HARDWARE FROM Variable Technologies! You will need to buy the NODE sensor platform for Android. No other sensor modules sold there are required.