The reason why a treadmill seems easier than road running is because it is. Now think about this imagine if you can, all you are basically doing is lifting the knees you are working the abductor muscles, the adductor muscles are not getting used the machine is doing that for you, these adductor muscles being the hamstrings and calves. Consiquently you have an imbalance in the muscular memory which as you can imagine causes long term problems. A lot of footballers have knee problems because of it, this has been a big problem for a long time but fortunately I have developed a machine to combat this where you can run without impact ,which trains the abductors and adductors at the same time. It also improves running gait and also makes the venus returns to the heart work 25% more efficiently. I dont want to give too much away but it should be on the market in a couple of months. Goodbye to motorised treadmills.