Brock O'Hurn Lets His Hair Down

Brock O'Hurn isn't one to keep his dreamy locks wrapped in a man bun when he's gettin' ripped ... obviously he loses the hair tie.

We caught Brock out at the rings in Santa Monica where he got in an impromptu gym sesh -- sans his shirt. Now we know how he sculpts that bod of his for Tyler Perry's new TLC series, "Too Close to Home."

Mr. Man Bun hit some dips, pull-ups and even swung around on the rings a bit, flexing every muscle north of his belt.