In this new age of recession-induced frugality, pricey gym memberships are being jettisoned in favor of annoying necessities like food, rent, and well drinks. But your biceps need not atrophy faster than your 401(k). The Mission Playground is there to pump you up for free. With black-top soccer, two tennis courts, and pickup basketball, there's no shortage of urban sporting endeavors to keep you in peak physical condition. And, for a small fee, there's the Mission Pool. Neurotic overachievers have even been known to do pull-ups on the nearby monkey bars when the youngsters aren't hogging them. There's also the ego boost of seeing the shirtless homeless guys hanging out at the front of the playground; almost everyone has a good body by comparison.