Sylvester Stallone rippin' pull-ups with a 100-POUND ANCHOR impressed the hell outta us ... but not Sly's wife, Jennifer Flavin, who says it's really ain't no thang!
Don't get it twisted -- Jenn wasn't sneezin' at Stallone's geriatric feats of strength ... where he pumped out 3 reps (give or take) with the weight of a small human tied around his waist.
"That's my man. Yeah, that's my man," Flavin told TMZ Sports
But when it came to the shock factor of the 71-year-old muscling up like Rocky in his prime, she couldn't see what all the fuss was about.