I have a level 3 Gym and a Level 1 Training Court. I don’t think there is a lot of data out yet on the estimated pops each one gives but my guys 18 yo seasons I got 22 pops on each player and have consistently popped every week in different skills. Then again other factors come into play like Trainer, YT, and Gym. I believe there is a forum thread that says an estimation on the amount of pops each level of gym gives but it’s not going to be extremely accurate. I hope this helped.