Riding a bike outdoors is difficult, which is why children require training wheels and adults don't ride bikes outdoors. Stay in and work up a sweat with this Groupon.
$59 for 10 Group Fitness Classes (Up to $250 Value)
Choosing from a buffet frees one to make spontaneous decisions, to enjoy more or less according to one's appetites, and to return for seconds. That's the reasoning behind the wide selection of classes at Hot Ryde, a fitness studio that includes a water-facing studio. The cycling instructors there lead indoor-cycling classes aboard RealRyder bikes, which tilt from side to side like actual bicycles. They also get all the body's muscles working together in low-impact TRX suspension training, which uses the body's weight and resistance bands.