July 27, 2005 Rock the Wall Summer in Deskopolis may have you climbing the walls. But there's a better way to gain a height advantage right here in L.A. Rockreation is a climbing gym with 10,000 feet of sculpted climbing terrain. Enroll in a Fight Gravity class to learn the basics and work some of the muscles you'll need in the great outdoors. $99 gets you three classes and a month's gym membership. Another option is to climb high. High-tech that is. On the walls at Absolution, the "holds" you grip on your climb light up to recommend a route. From the same folks who brought you the Spy School workout, this climbing experience packs a video game feel. Jump into a clinic here for $25. But if the idea of an indoor climb doesn't get your rocks off, Absolution can hook you up with a climbing expedition on a mountain that's for real. Prices start at $100. An upside to the sport is that it's an all-over body workout, burning 700 to 900 calories per hour. All that pulling yourself up builds your arms — and most of all your hands. And you know what they say about big hands … Absolution: 8535 Santa Monica Boulevard West Hollywood, CA 90069 Rockreation: Sport Climbing Center 11866 La Grange Ave. Los Angeles, CA 90025