Power rod home gyms have surged in popularity over the last decade, driven primarily by the Bowflex brand of home fitness equipment until you can afford to purchase something that has good customer satisfaction ratings and is made by a respected fitness equipment manufacturer. Also be aware that some types of equipment against your criteria. When looking for an elliptical trainer, whenever possible opt for a rear drive system rather than a front drive system. Rear drive machines are far sturdier, more reliable, and provide a smoother motion for the user. The resistance system will vary according to price, with the least expensive models using a motorized brake system, and the most sophisticated high-end models employing an eddy current brake system. Stride length is another important thing to keep in mind, because different people have different natural strides. Look for an elliptical trainer that allows you adjust the stride length to suit your own body style and stride length. Next step... buy a piece of equipment before purchasing to be sure it feels comfortable.