If you don’t have time to go to the gym The S2 exercise bike at under $500.00 is a solid investment
The S2 exercise bike is reliable and sturdy 40 pound flywheel and smooth resistance knob ensure smooth, cycling interval training, with a soft-grip handlebars and interchangeable seat.
Indoor training bike mimics the natural feel of cycling outdoors
Heavy-gauge steel frame, 40-pound balanced flywheel, and Poly-V drive belt
Fully adjustable seat and handlebars make it easy to ride in proper position
Seat and pedals are interchangeable with any standard bike components
Measures 44 x 44 x 22 inches (D x H x W) and weighs 97 pounds
http://amzn.to/1Ov0R2A

http://www.indoorbiketrainer.net/indoor-bike-workouts/