Early fitness buffs were known to work out by angering Greek gods in hopes that they would be punished and forced to push boulders up a hill for eternity. Get in shape at your convenience with this Groupon: for $24, you get a 30-day Passport membership to Boston Sports Clubs (a $49 value). Passport memberships can be redeemed at 23 Boston Sports Clubs locations.

Boston Sports Clubs, part of Towns Sports International's network of fitness loci, welcomes exercisers to a number of equipment-stocked facilities to help attain perspiration-soaked fitness goals at a convenient location. Strength-training gear such as circuit machines, free weights, and medicine balls filled with black holes mold muscles into chiseled depictions of physical might. Calories simmer and move to cooler climates after sessions on cardio machines ranging from treadmills and ellipticals to upright and recumbent stationary bicycles. Each club offers a schedule of group classes that draw from more than 100 fitness styles, including Pilates, yoga, and boxing, to keep members from jazzercising without a spotter. Each location thanks exercisers for sweating in its vicinity with special features, such as babysitting, saunas, and steam rooms, though Passport memberships do not include pool access.