The McFly star, who previously admitted to being "obsessive" over his physique, told Attitude that fans must be getting tired of seeing him shirtless.
"I'm not embarrassed, I'm over it," he said. "With Strictly the nerves just disappear, I should be so embarrassed but I think, sod it... People must be thinking, 'Put it away mate, that guy is obsessed with himself'."
He added: "Pre-working out, I thought people who did were vain and the gym was for losers. Now I work out I totally get why people do it... It's become a mixture of health, enjoyment, the challenge of the gym and a vanity thing."
Judd revealed that he stepped up his exercise regime and encouraged his McFly bandmates to do the same after becoming concerned that they were no longer an "attractive band".
"We were talking about how we were older but had teen appeal and could be an attractive band. So for the next campaign we said we should really get in shape," he recalled.
"'I went at it quite hard. We were in Spain and they came into my room and I had my top off. They said, 'F**king hell, mate, you're massive'. Next thing you know, all three of them were on the floor doing press-ups. That gave them a kick up the arse."
Judd will compete against Chelsee Healey and Jason Donovan in the Strictly Come Dancing final, which airs Saturday (December 17) at 7pm on BBC One.
> Gay Spy: Would you object to some more pictures of Harry Judd with his top off?