If it’s mind-body (and financial) bliss you seek, try Yoga to the People (12 St. Marks Pl at Third Ave, suite 2R; 917-573-9642, yogatothepeople.com), where power vinyasa classes are daily, open-level and, best of all, by donation only. Fat-burning isn’t for everyone—stock up on calories instead with free Tater Tots and well drinks at Trash Bar (256 Grand St between Driggs and Roebling Sts, Williamsburg, Brooklyn; 718-599-1000) from 8 to 9pm when you pay the $6 cover. Or, down all the white wine and Coke (diet or regular) you can drink, free with your meal at Chinese joint Silk Road Palace (447 Amsterdam Ave between 81st and 82nd Sts, 212-580-6294). If it’s alcohol alone you’re focused on, walk to Bar Coastal (1495 First Ave at 78th St, 212-288-6635) and spend your saved subway bucks on a cocktail or pint instead (they’re $3 from 4 to 7pm every day). Meanwhile, there’s a buy-one-get-one-free fest downtown on weekday evenings: Among the many participating bars are Agozar (324 Bowery at Bond St, 212-677-6773) and Le Figaro Café (184 Bleecker St at MacDougal St, 212-677-1100).