Eight weeks ago on December 11,2017 I had my second THR (right hip). Five years ago I had my first THR (left hip). After my first THR I waited five months before running but I consistently did a lot of biking, swimming and strength training Fortunately, I have had no issues with the first THR and continued to run and participate in road races and triathlons until last October when the pain in my right hip prevented me from running. Just three weeks after my second THR I began running on the Zero Runner. I have progressed from five minutes in week three to thirty five minutes in week eight. I have some soreness after using the Zero Runner but no pain while on it. I feel like the Zero Runner has greatly assisted me with my rapid recovery. While I am anxious to run outdoors, I think I will stick with my plan to run only on the Zero Runner for the first four months before hitting the road. Also, at age 61, I intend to continue doing a substantial amount of my training on the Zero Runner. While I have no more hips to replace, I want to try to save my knees. I highly recommend the Zero Runner for all hipsters that can fit it into their budgets. Once again, thank you to Tom for recommending the Zero Runner.