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Look out, Suzanne Sommers: Your ThighMaster`s got a competitor with its own celebrity spokeswoman.

Former ”Charle`s Angel” Cheryl Ladd has been signed to help pitch the new Body Slide, a board with padded ends that comes with special ”booties”

to wear while gliding from side to side.

”It`s a terrific cardio-vascular workout,” says Carol Land, a vice president for Ovation/Body Solutions, which makes the Body Slide and ThighMaster.

Introduced at the National Sporting Goods Association`a Sports Expo this month in Chicago, the slide costs $49.95, comes with a video, and will hit stores in October.