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Gunna My Secret to Staying Fit ... Sexercising!!!

Gunna's turning heads lately with his new slimmed-down look ... the result of him getting in lots of cardio action, which, he hints, mostly happens in his bedroom!!! 👀

TMZ Hip Hop caught up with the "Fukumean" rapper burning down Bev Hills, per usual, and hit him up for the secret to his weight-loss success.

He gave us the pumping-iron gesture -- but quickly clarified it's not dumbbells he's lifting, instead, he's lifting legs!!!

Hey, sometimes shacking up can be your best bet, especially when you're on probation!!!

Gunna's got a big show out in L.A. tonight -- to match his recently sold-out concert in NYC -- and told us he enjoys performing every last one of his songs from his hit album "A Gfit & a Curse."

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It's just as Cuhmunity's AD told us when we asked him to gauge Gunna's temp in the rap climate -- he predicted L.A. would welcome him with open arms and celebrate his music.

But, while he's here ... sounds like the real party will happen behind closed doors. Fitness first!

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