"STIFFY" Back Plate Kettlebell program and most importantly establishes the

and most importantly establishes the habit of daily exercise

grip endurance

Vitamin B6 (as Pyridoxine HCl)

K: Knowledge of Fundamental Physiology

"STIFFY" Back Plate Kettlebell program and most importantly establishes theYou asked, and we delivered. Some of our customers recommended an upgrade option for the backplate of the kettlebell backpack to provide a "stiffer" backside of the backpack. So we did it. Our backpacks already come with their standard backplates like always, but they are definitely flimsier in comparison to the "STIFFY." At 3 16" thick and barely bendable, this backplate provides a substantial improvement in the "stiffness" of the backpack's backside.