10X Fitness Share definition Flag A fitness regimen created by a US Army Soldier, who wants to share his knowledge and skill in health and fitness training. In 2012 I began using 10X Fitness to help improve my workout. 10X Fitness by 10Xfitness February 15, 2012 0 0 Get merch Get the 10X Fitness mug. Buy Now — $32.95 See more merch