For those who want to be really buff, a Dutch gym is introducing training sessions for nudists.
The Sunday morning sessions were added by popular demand and "anyone who shows up just to ogle will be thrown out," said gym manager Patrick de Man in the town of Heteren.
"This is a special session for naturists and we will be very strict in enforcing this," he said.
The "nudifit" sessions, which will begin on March 4, have attracted a strong response -- both negative and positive, he said.
Staff, who will remain clothed during the sessions, will pay special attention to hygiene, ensuring clients cover machinery and bikes with towels or disposable covers, he added