Before you decide which indoor exercise to buy, you'll want to consider several things including cost, size, display screen and whether or not you'll need a monthly subscription. If your main goal is to simulate the experience of riding outdoors, for instance, you'll want a bike like the Bowflex VeloCore, which offers a realistic road feel and can mimic the way you lean in to turns. However, if your main goal is to get the most bang for your buck, you'll want to consider something like the Bowflex C6