#1 Common Gym Mistakes and Simple Solutions to Them As a Personal Trainer I see the same mistakes again and again, and again. This thread is my attempt to help you guys and girls from falling into the same old traps. I have tried to combine real life experience, stuff from text books, various training courses and stuff from science to create a good list for you all. I have over simplified certain aspects, as I do not want to get all sports sciencey so please keep that in mind too. 1.