Snap Fitness is an affordable gym for the dedicated, independent runner or weight lifter. Stripped down to the bare essentials, Snap is a one-room schoolhouse of workout equipment. It doesn't have classes, but personal trainers are available for hire. The gym is open 24 hours, meaning you can work out at 3 a.m. if that's your style. Snap's long hours and multiple neighborhood locations make even the peak times tolerable, and most equipment is available without a wait. Be forewarned: There is no locker room, so sweaty customers are left to shower at home.