Okay, we are digging into our sense of humor on this article! We are sure many of you can relate to the frustration of at least most of the items on our list of top 10 gym pet peeves. We always instruct our clients (no matter what kind of fitness establishment they are working out at) on how to be courteous while working out.    1.) When somebody grabs weights and starts exercising right in front of the rack: In the words of the Miz: "Really? Really? REALLY?" Let's forget…