Run faster without the pounding
Michael Arnstein, now an accomplished ultramarathoner is giving a talk regarding his training tools and secrets. Notice the PowerCranks bike on the stage. Notice he has the seat post turned around to bring the seat forward so he can be more upright as in running. For you aspiring ultra athletes (this includes Ironman) you might find this very interesting.
Michael Arnstein is an accomplished ultramarathoner. In this interview though he is an accomplished marathoner who is doing Ironman and talks about his experience with PowerCranks and how they have helped his running.
Ultramarathoner Oz Perlman discusses his running background and secret weapon, PowerCranks in this interview. I think he would describe them as magical.
Michael Arnstein is demonstrating one training use of PowerCranks to several friends.