The problem with Dick Mills is that he changed his coaching style long after his own career. The reason he changed his style is because his son was a top draft pick and then had serious arm problems. What Mills is teaching now is something that is even new to him. I wouldn’t take advice from someone who hasn’t practiced what they preach. I have never read TuffCuff but I assume it is a collection of Steven Ellis’ off-season pitching routine. This to me is worth reading.
I have also put together the AcePitcher Handbook of my off-season routine which allowed me to come back after almost career ending shoulder surgery. My handbook has my Fusion system which is everything from joint integrity training to total body training. Weights, ploymetrics and speed work is the best way to develop explosive muscles.
What I have learned is the best Coaches are ex pros that were forced to overcome a major obstacle. This is because they have been forced to learn their position mechanically. Natural athletes usually have no clue why they perform better than others. This is why natural athletes make bad coaches. Dick Mills was a natural athlete who later on in his life began to analyze his game.