This isnt enough info to be 100% conclusive but I would beleive that the trainer would do this without a reason. [/quote]
Ehhh, I just shook my head. Hopefully he’s doing this because of some evidence the trainee has presented. Something along the lines of results taken from a test to show wether or not the trainee is dominantly fast-twitch, dominantly slow-twitch or more of an “equal” mix.
The trainee might possibly have dominantly slow-twitch upper body muscles involved in the bench press (triceps; chest; deltoids), this could be one reason why the trainer has chosen X reps for X sets. If he’s doing this simply to give you some random sets/reps to see a change your routine, ehhhh I guess it’s “okay” but even then is this what you are paying for? Why not just pick 2 numbers out of a hat.
Personal trainers might give you some unexplained protocols, but good can still come from this. Your trainer is there to push you and see you succeed, when his knowledge limits these expectations then it’s time to get another trainer. If he’s there getting you to your goals then it’s money well spent. If he’s there getting you to your goals and giving you the tools so you can do it yourself then it’s a good investment.
To the original poster: Don’t be affraid to ask “why that many reps?” or “why that many sets” or “why that long?”.