Great points here! Just to piggy back off of this, a lot of these personal trainers are coaching things that we as coaches will never coach due to the system we use. An example, if you are a running back, your personal trainer might be working with you on cuts, balance, acceleration, footwork, agility, and other things of that nature. In our offense, the first thing we learn as HB is how to block. If you can't block in our offense, i don't care how good you look with the ball in your hands, you can't play HB for us. You could be a great Kick Returner or Punt Returner for us, but HB is out of the question if you can't block. Probably not something you hear typically when talking about running back or half back position.