Cover-up . . .

Exerciser/actress/model/spokeswoman Heather Locklear works those exercise machines in those TV spots for Holiday Spa Health Clubs. But, hey--how come she can wear revealing work-out clothes--showing her midriff and bare arms--when actual club members can’t.

Consider the Holiday welcome packet, which asserts, “We desire to maintain a safe, sanitary and pleasant exercise environment. The following rules will help prevent you from having to exercise in someone else’s sweat!”

And there it comes complete with dress code!

Unlike the sparsely clad Heather, members are required to wear a T-shirt covering chest, back, shoulders and underarms. No bare backs, midriffs, chests or cut off sleeves or shorts are permitted.

So what about Heather?

“We don’t film her in a club, that’s how we do it,” said Craig Braasch, an exec for J. Walter Thompson Agency, which handles Holiday spots.

“We try to keep the outfits as close as we can to the actual required outfits,” Braasch added, “but it’s tough without having to put her in a T-shirt. It’s not quite as appealing.”

In fact, added Braasch, former Holiday spokeswoman Cher would wear clothes so far from what people actually workout in (including “chain mesh”) that they had to keep her far away from the equipment. “But she had celebrity power,” he said.