1. People lifting directly in front of the dumbell rack while others are trying to get through to grab weights. 2. People who try to wait for you to finish your set and just stand there. 3. Out of shape or skinny bfs who are clearly being taken advantage of by their hot gf and are used as camera men. 4. Out of shape personal trainers. 5. People who space out on their phones while hogging a machine for too long.