Stationary bikes replicate the aerobic benefits of outdoor cycling without the hassle of trapping, feeding, and housebreaking a live bicycle. Jump on a tame tandem with today's Groupon: for $70, you get 10 spinning classes at Asphalt Green in Manhattan (a $145 value).

A nonprofit fitness organization dedicated to bolstering the bodies of both members and guests, Asphalt Green provides tech-savvy training tools within the verdant corners of its 5.5-acre athletic campus and throughout New York City.

During each super spin class, riders can saddle up stationary steeds in the gym's new dedicated spin studio for a cardiovascular recalibration that combines strength conditioning with endurance exercise. Max out muscles with motivation from Asphalt Green's team of instructional wheel-wizards, or set your own individual pace with help from pumping tunes played over the studio's state-of-the-art sound system. Over the course of 10 classes, Groupon holders can sate callisthenic itches with bike-shaped backscratchers or prepare for payback on the day they finally catch up with that thieving Italian poster-hanger.

Cyclists can schedule their stationary excursions throughout the day using Asphalt Green's easy online reservation form. Riders should arrive for class early, as bikes that remain unclaimed three minutes prior to take-off will be given to standby guests or sold as generators to budget-minded power companies.

Reviews

Citysearchers give Asphalt Green an average rating of 4.5 stars, 15 Yelpers give it an average of 3.5 stars, and more than 680 Facebookers like the fitness complex.