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Boldfaced names increasingly are sweating without sweating the paparazzi waiting outside or a camera-phone-enabled jock on the next treadmill.

For years, West Hollywood's trainer-only THE GYM ON NEMO (9041 Nemo St.) has been a go-to choice, with owner Fedele De Santis welcoming the likes of Cameron Diaz and Charlize Theron to his discreet storefront for Pilates and boxing alike. Over on La Brea, the no-nonsense ULTRA BODY FITNESS (828 N. La Brea Ave.) lures such stars as Shia LaBeouf and Chris Pine.

More exclusive rivals are cropping up. Gunnar Peterson - who has rocked the bodies of Jennifer Lopez and Hugh Jackman - quietly has run an unlisted-number space (9975 S. Santa Monica Blvd.) for the past three years above the Sonya Dakar spa in Beverly Hills, where valet parking and protein bars are complimentary. Another big-time trainer with his own gym is Jason Walsh, who has worked with Justin Timberlake and WME's Patrick Whitesell. "My facility is very private - it's good for people that need an inviting and calm environment, " he says of his RISE MOVEMENT in WeHo (8906 Melrose Ave.).

Opened in mid-2010, LEAF WELLNESS STUDIO (1617 Broadway St., Santa Monica) handles just 12 clients at any time and insists on a three-month commitment ($3, 600 for 24 classes). Leaf, whose clients include Rock of Ages up-and-comer Diego Boneta and XXX writer Rich Wilkes, also runs a Lifestyle Transformation program with nutrition counseling and personal coaching.