Believe it or not, a lot of people just like drinking cold bubbles after a workout. When I posed the question to my friends on Facebook, I received three different versions of the answer "Bubbles!" as to why they enjoy sipping on a brew post-sweat sesh. My sister said, "The carbonation tastes so good when you're thirsty,” a woman I used to go to church with said, "I like beer! I like carbonation, too!," and an acquaintance added, "I just want something besides water… and I like bubbles."
I take all of this to mean beer is cold and refreshing, and after a tough workout, there's something to be said for cold and refreshing.
It's good for bonding and motivation
There's no question that alcohol is a social lubricant -- it loosens people up a little, gets the conversation flowing, and helps turn a standard workout into an event… or an event into a party.
Just take a look at all the races that now offer beer to participants at the finish line (Tough Mudder and Spartan Race are just two of 'em). Race directors know that finishing a tough event is celebratory, and that participants want to hang around with other racers to talk about the experience. Offering beer at the finish line is a way to encourage people to stick around, to cheers one another, and amplify the celebration. And if people end up having a good time, they’re more likely to sign up for more races.