Riding your bike indoors is less than fun. Sure, you put in a few movies, or blast the music, but nothing reminds you more that you aren't outside and that you probably aren't maximizing those indoor miles. CycleOps knows how hard it is to focus indoors. Its Fluid 2 Power Training Kit is an affordable, yet highly effective indoor training system that also features power numbers. Now, instead of staring at re-runs or worse yet, the wall, you'll focus on your riding First, this training kit includes the CycleOps Fluid 2 Trainer. What makes a fluid trainer different from a magnetic trainer? Well, the resistance unit, rather than being a giant magnet, is encased in hydraulic fluid. Unlike a magnetic unit, where the resistance is external and variable, a fluid trainer relies on pedal speed to increase resistance. Therefore, the harder you pedal the more resistance you experience. Additionally, CycleOps uses Power Band technology that makes the level of resistance also a function of gearing and cadence.