Here's something that'll make you feel REALLY unathletic ... Nationals star Ryan Zimmerman suited up in goal for the Capitals on Wednesday -- and saved an Alex Ovechkin slap shot!!!
Unclear why the Washington third baseman decided to trade in the mitt for a set of goalie pads this week ... but he sure as hell impressed everyone watching at Caps practice.
Zimmerman got between the pipes and stopped one-timers from Ovi ... and later got in some shootout drills, where he didn't suck either!
But, the most impressive part?