Robert F. Kennedy Jr. is gearing up to inflict his haunting health agenda on the country — but first he’s coming for the Hudson Yards Equinox. According to “Page Six,” RFK Jr. has rolled through the upscale fitness club several times in his signature denim workout fit lately, stunning the Alo-wearing clientele with his rugged flair and sick pull-up skills.

“He works out really hard,” one gymgoer told “Page Six,” adding that RFK Jr. “wears tight jeans” and has been “lifting weights.” Another source claimed he runs on the treadmill in hiking boots, which some onlookers find entertaining, and looks like a “construction worker.” Apparently not all dues-paying Equinox members recognize the 70-year-old future face of American health, and there were whispers of “Who’s that older guy?” when he and his three security guards strutted past the eucalyptus-towel fridge.

Ever since Donald Trump named RFK Jr. secretary of Health and Human Services, he has really made an effort to make his physical prowess known; earlier in December, he posted a video of himself doing some kind of pull-up-flip move at a Venice, California, Gold’s Gym, joking (?) that he was “practicing moves for my confirmation hearing.” Who do you think is more impressed by his leathery pecs: horny moms at Equinox or Republican senators?