Stronger is a website that provides specified strength training programs for runners. They offer a free 4 week GET STRONG program. Then, move on to the month by month paid program. Stronger Runner was created by runners for runners. The focus is being a stronger runner and getting the most bang for your buck through quick strength sessions. Check out their strength test. Running is great exercise, but if not supplemented with upper body, core and leg exercises a runner gets weaker.