Discreet. Word-of-mouth. Old-school meets new-school. And very good-looking.

Dion Jackson’s retro-modern workouts have trimmed everyone from Rob Lowe to J.Lo. His appeal is fabulously anti-fabulous. No bun-busting gizmos, no stupid shortcuts, no wellness mumbo jumbo. Just cardio, crunches, dumbbells, and boxing gloves. (With a side of heavy sweating.) Which is to say that Jackson’s cocoony gym may be located near Crunch, but psychologically it’s worlds away.

He charges celebs about $250 an hour, but civilians (musicians, journalists, you) pay according to their means. Everyone gets A-list treatment and a lovely mini massage.

Of course, this being Hollywood, the secret won’t last.

But you can still go around bragging that you knew him back in the day.

Dion Jackson, 1538 North Fairfax Avenue, between Sunset and Hollywood Boulevards (323-876-0854 or dionthetrainer@aol.com).