Look if a team subs constantly and the players of that team know that, what motivation do they have during practice to become better? Is it to try and get a starting position, but oh wait, they get subbed in on the 15th minute of every game and play for a good 20 minutes, does that encourage a player to play to his full potential ? It's not necessarily the subs that i'm worried about here, its player morale and a players ability to gain improvement each practice because of that extra effort they give to impress the coaches. As for running 3 miles a day, that should be a usual thing during soccer practices, you may not realize you run 3 miles every practice, but you do, it's not a rule, its a natural thing.
