While this in itself might not be a strange choice, what he wears there is.

“He works out really hard, lifting weights and he does the treadmill.

He wears tight jeans,” the source explained.

RFK Jr. frowning

And, his fellow gym-goers aren’t the only ones who are baffled by his preferred athletic wear.

The internet is taking note, too.

RFK Jr. benching outdoors in blue jeans at 69 years old… huge summer vibes.

RFK Jr. doing pull-ups in jeans

Biden/Trump have zero chance.

This man is a true American leader.

Something isn’t right."

They are far from alone in their feelings.

“Why is rfk jr always working out in jeans” another userasked.

“SERIOUS QUESTION: Has anyone looked into why RFK Jr. works out in jeans?”

someone elsewondered, adding, “Like what’s the deal?

Have I just happened to miss this much-needed piece of investigative journalism?”

Unsurprisingly, the fashion quirk is becoming a running joke of its own.

Sounds like a deal that would earn the Department of Health and Human Services' seal of approval.