Actually, I suggest we increase the default walk speed all together; the idea for a gym was a compromise.
I strongly believe it adds depth to the gameplay, while simultaneously fixing alot of the problems people have with guns.
By increasing walk speed, it opens up another dimension to dodging bullets, so focus would be more on a player's raw skill level than the gun they're using. Obviously a better gun would still have impact, but a skilled player with a weaker gun can still contend. I'll post a video later on to demonstrate what I'm talking about.