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He went from pudgy to skinny on “Celebrity Fit Club” … but now Warren G is straight up muscular … and it’s all thanks to his brother, Dr. Dre.

The rapper tells TMZ … he let himself slide after his stint on the reality show back in 2007 … but was recently inspired to get his ass back in the gym after a brutally honest conversation with Dre.

“A lot of people in my family have high blood pressure” … Warren says … adding, “Dre told me I better start hitting the gym … so I took his advice.”

Warren says his “feel good workout plan” consists of running and boxing nearly every day … along with cutting the crap out of his diet.

Still, Warren admits his renewed exercise kick isn’t just health related — “Seeing Dre looking all cut up and in shape made me want to get myself together and look right, too.”

Gotta respect the honesty.