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You never forget how to ride a bike. But you’ve also never ridden one quite like this. Endorsed by British Cycling, the governing body for the sport in the United Kingdom, the Wattbike is the first affordable indoor bike that fully replicates the rigors — and the results — of the road. As its name suggests, the ?Wattbike measures the power, or watts, that you produce with every pedal, providing instant feedback to ensure that your workout is on track. Air and magnetic braking systems mimic the feel of outdoor sessions, from low-intensity riding to high-altitude training, while a computer measures your performance 100 times per second and displays the information you request. $2,995, www.wattbike.com