When I was a kid those spring loaded hand exercisers were a mystery to me. I could barely get them to budge using both of my hands. Once a friend and I were playing with his dad’s free weights. We took turns using a one handed barbell trying to see who could lift it the most times in a row. We thought “Wow, this weight lifting stuff is easy!” The next day we were both in so much pain we could barely lift our arms to do anything.