Buying a treadmill is a major step in building your home gym. Do not take the leap until you have considered these tips on treadmill types, key features, cost, and product reviews. Part I: Things to consider when buying a treadmill Every treadmill is essentially the same, much as every car has four wheels, two bumpers and an engine, and so too, there are common traits every treadmill share. However, the materials making up these features can vary as much as apples to oranges. So, take note...