The following gym chains are among those offering 30-minute workouts in the Washington area. Others may join them soon. Quickie programs range from do-it-yourself circuits on preset weight resistance machines to supervised routines on fully adjustable equipment with a trainer by your side. Gyms usually will give prospective members a free trial session before they enroll.

* CURVES, www.curves, 800-848-1096. 30-minute workout for women only with preset strength training machines and podiums for aerobic exercise. $39 to $69 per month, depending on location.

* CUTS FITNESS FOR MEN,, 732-381-9300. 30-minute workout for men only with strength training interspersed with aerobic options such as punching bags. $39 per month; Washington area locations are scheduled to open this summer.

* LADIES WORKOUT EXPRESS,, 800-833-LADY (800-833-5239). 30-minute workout for women similar to the program offered at Curves. By late summer, the gyms plan to offer coed locations. $30 per month.

* WASHINGTON SPORTS CLUBS,, 800-301-1231. 22-minute XpressLine offers eight dedicated strength training machines, staffed by personal trainers during hours specified by each gym. $40 to $80 per month, depending on location.

-- Francesca Lunzer Kritz