Most people like the idea of going to the gym in theory, but it takes a particular kind of d-bag to find the actual atmosphere at your average fitness center appealing.

There's only so much antiseptic spray, intro-to-spinning classes and piped-in Madonna a person can handle before he remembers that, hey, "Final Fantasy XIII" just came out, and there are no flickering fluorescent lights on the couch at home.

That was pretty much the exact experience of Richard Hilton, who started London's GymBox on the premise that going to the gym could actually be fun. And by "fun," we mean "kind of insane, but in a mostly awesome way."

Asylum caught up with Hilton to find out how he put it together, what happens during rave classes, and what on Earth "boob aerobics" are.

"It started as a joke," Hilton tells us about the boob aerobics class, but the idea behind GymBox is more serious. "Why couldn't a gym be a place of entertainment? After all, it's people's leisure time."

With that in mind, he started to build his perfect gym. "I got the best nightclub and graphic designers to work on the design, brought in a lunatic creative to work on the class timetable, and found the best boxers and MMA fighters in London and gave them a home," Hilton explains. After finding "somebody who believed in the madness" to offer financial backing, things kicked off in 2003.

The design aesthetic, the laser-light shows and the live nightly DJs are all selling points, but the real appeal of GymBox is the off-the-wall class schedule. While your average gym might spice up their regimen of spinning and Pilates with the odd boxing class, boxing is the absolute tamest offering on the GymBox menu.

Weirder classes include cage fighting, parkour, stiletto workout and "Lady Gaga Dance." In the past, the gym has offered something called a "human weight machine", which involved using, yes, little people as weights, labeled according to how many kilograms they tipped on the scale and shouting encouragement to the person lifting them.

Our favorites of the current crop of classes are the real oddballs: "The rave," Hilton claims, is "the ultimate dance class. It's been running for about 18 months. It's smiley T-shirts, glow sticks, trampolines, rave music and smoke machines -- an old-fashioned 'warehouse rave,'" he says, before adding that it's "without the drugs."

And, of course, there's the infamous boob aerobics. So what exactly is that?

Hilton says his staff asked, "Wouldn't it be great to create a class that would help women increase the size of their breasts?", which is why he started offering the program. "We never expected it to work, but after the eight-week course, 80 percent were saying that their bust had increased. It worked."

Which sounds unlikely, and Hilton's as perplexed as we are: "To this day, we still don't know how."

With that in mind, we can't wait to see how many dudes show up for "hair re-growth kickboxing."