Blood&Iron said:For the same reason that anyone who knows anything puts on plates with the flat side facing out.
You know, I'd never thought about that before, but I always put the plates on flat side out? I looked around at the gym today and EVERYONE had the plates on flat side out. The only reason I can think of is that with the 100s it makes them easier to load on the leg press if you grab them with the lip on the inside and the flat side against your chest if you have to pick them up off the floor or a low peg. Other than that - who knows why? Of course, you could say "who cares" too, but I like to think there's some sort of right way to do most things, unlike the nimrods in my gym who can't seem to put the plates on the trees in the right order even though the fucking numbers are PAINTED on the pegs! (We have the kind of plate trees that if you don't use the right order, the plates start blocking each other.) That's my pet gym peeve - I can live with people curling in the squat rack (of course if we didn't have three squat racks and a power rack, that'd be a problem), but dammit, how hard can it be to put the plates on the tree right, and put the damn dumbbells back (a) period instead of leaving them on the floor, and (b) in ASCENDING ORDER like the little numbers painted on the rack tell you to! (OK, deep cleansing breath, calm down...)
But Lord_Suston is right - I went to the gym on Monday last week for the first time in months (Monday is usually a scheduled off day for me) and 90% of the people in there were doing chest! My theory is that a lot of guys either ate and/or drank too much over the weekend and want to feel like they're really getting serious on Mondays, and what makes most guys feel best in the gym? Benching. The Monday=Chest thing seems to be pretty much a given - in the first Max-OT routine on AST's website, they specifically give "everyone doing chest" as the reason they put legs on Monday.