If someone is standing in front of the dumbbell rack and you go to grab a dumbbell(s) in their vicinity do you ask if they are using them first? I had some guy confront me because I didn't ask. He said "it's a courtesy." My feeling is that "it's a courtesy" not to do your curls/shrugs/whatever in front of the rack because it prevents people from getting to the dumbbells. If the dumbbells are on the rack then that means no one is using them. Thoughts?