An increased heart rate at the gym can be a sign of having a great workout or of falling in love with your treadmill. Speed-date while sweating with today's Groupon: for $39, you get a 30-day membership to 24 Hour Fitness Derek Jeter Ultra-Sport Club SoHo, redeemable at the Crosby Street location (a $169.99 value).

Designed in collaboration with All-Star short stop Derek Jeter, 24 Hour Fitness Derek Jeter Ultra-Sport Club SoHo stocks its loft-like Soho gym space, open 24 hours, with motivating group classes and equipment from brands such as Cybex, Precor, and Life Fitness. Heart-rate monitors track tickers as clients exercise on rows of treadmills, stairmasters, and elliptical machines, each adorned with amenities such as personal video screens and sticks dangling juicy, Gatorade-flavored carrots. Weight plates on Nautilus strength machines ring out with loud clanks as muscles bring them smoothly up and down, and free weights strain against hands, yearning to obey the dictatorial laws of gravity. Polished wood floors gleam at the base of open-layout group-fitness rooms, in which enthusiastic instructors lead classes such as cycling, Zumba, Les Mills, and high-resistance knitting with weighted needles. Though not included in today's Groupon, 24 Hour Fitness Derek Jeter Ultra-Sport Club SoHo also offers personal-training sessions with expert staff for an additional fee and other membership options that customers can learn more about here.