Good afternoon; Could anyone suggest some Mathematical Formula (based on own experience or scientific literature) to know the max rep on Grippers closing? I know some people suggest using Welday (1988) and or Epley (1985) for free Weights (Max Rep = KG + 0,0333*KG*RepsNumber) ; but considering the fact that Grip Training differs from the concept of free weights that we see (for example) on Powerlifting; may be there's a more exact formula. Best Regards; Nikola.