'Strong' Trainer Grilled Over Nude Photos

4/19/2016 12:50 AM PDT

'Strong' Trainer Grilled Over Nude Photos

EXCLUSIVE

"Strong" trainer Adam Von Rothfelder has become instantly famous as the breakout star of the new show ... so like half of Hollywood it's not a big shocker nude photos have surfaced. 

Turns out Adam posed nude for an art project and the pics are ... impressive. The honchos on "Strong" were a little upset ... not because of the pics but because Adam didn't fess up before he was hired.

We're told Adam explained he didn't think it was a big deal because it's not pornographic. Producers saw it his way, so he won't be punished. It helps he's also a big reason people are watching. 

Dave Broome -- the creator of 'Biggest Loser' and "Strong" -- is a big, big fan of Adam's work ... telling us, "I am actually rather envious."