Those of you who enjoy the exercise bike at the local gym and have considered buying one, might want to consider another option. Do you own a bicycle already? If you do, you should consider looking into a bike trainer instead. This can save you a lot of money and also a lot of storage space. A trainer is a stand you attach your bike to that provides resistance similar to biking through the use of air, fluid, or magnetism. They take up very little room in comparison to a normal exercise bike.The three types of trainers each have their own unique qualities. You will need to decide what works the best for you. Wind trainers use a fan to create resistance with the air that you work against. They are the cheapest of the three, however they are very loud when pedaling. They work well for beginners because the resistance can be on the lighters side. The harder you pedal the more resistance you will gain at least to a point. Trainers that use magnets are pretty mid ground as far as trainers go. Comparable in price to a wind trainer, they fit better for a beginner to intermediate rider. They are quiet in comparison to wind, however the quality of resistance isn’t the same level as a fluid. Fluid trainers are considered to be the best, and create a more realistic feel to that of riding on the road. However they are generally more expensive, and do have their own problems. The unit uses a "fan" encased in liquid, which creates resistance, however the added complexity of the machine, leads to more wear and tear over time. Some models seem to have a problem with leaking.