I'm always looking for new ways to improve my fitness and enhance my running training, and one of my favorite is the mini trampoline, also known as a rebounder, which I use for 'rebounder running,' running in place on the rebounder. It is an affordable, relatively small piece of equipment, making it a great alternative to a treadmill and a good way to add miles while at home by running in place on it. Because it maximizes the plyometric element of running, a mile on a rebounder probably has greater impact on running conditioning while being, in fact, a much lower impact exercise, and so, easier on the joints. While running, when done correctly, doesn't ruin one's knees, for most runners, there is a point at which adding more miles would likely cause trouble, but like pool running, this is a gentler movement, from that standpoint.