Speaking as a drummer first and foremost I have to say playing a two hour gig in front of a large crowd is totally draining, your heels are off the floor most of the time, you are counting in your head, remembering lyrics, and trying to keep the pace at the correct level despite your guitarist trying to run away with it...
Never mind you have to get there a good hour before everyone else to set up and you're usually the last to leave (although the days of Roger dismanteling his own kit are long behind him), just tuning up and playing for two hours is just as physically draining as running a 5-10K trust me.
If you had to pick the easiest job in a band it would be the keyboard player, it's much less physical.
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