Exercise equipment is costly, so you must consider your finances before you buy. If you are really going to use it! In conclusion... Power rod Traditional 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 manual system, mid-range models using a manual system, mid-range 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. Crunches can also be done on an exercise ball and many feel it is more effective than standard crunches. You sit on the ball and place your feet on the floor about a foot apart. Roll back carefully on