Calvin Harris is pumped for 2 reasons ... he hit the weights Thursday, and he's getting ready for his big moment with Rihanna.
We got Taylor Swift's ex leaving a gym in WeHo, and he could not have been in better spirits ... despite what is now clearly a bitter breakup which he believes involves cheating and lying.
Calvin was pretty talkative -- for Calvin -- telling our photog about his plans with RiRi as some awestruck fans got a big prize.
And check out Calvin's kicks ... Yeezys. You'll recall, Taylor's war with Kanye is back on, and Calvin is clearly a general in the army of the West.
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