When using a JSET training plan you are using exactly the same training plan that has taken me from a 3:24 marathon to a sub 2:30 marathon. In fact, the only reason JSET exists is because friends and family were asking me to set them up with training plans. Over the years I have continually updated the training plan, making it more motivating, easier to follow and improving the way data is presented. But I don't hold any of these updates for myself. If it's useful to me it's probably useful to other people as well, so an improvement to my training program is an improvement to the whole JSET community. There's an overview of how the JSET process works below.