This is a follow up, and contrasting argument, to Viktor’s review of Vibrams. This past weekend was the Tough Mudder Wisconsin. I decided to run in my Vibram Bikilas. I have been trying to run at least once a week in the KSOs because they aren’t quite as “colorful” as my Bikilas. I also started the Insanity workout the week before the TM with the KSOs. In short, my calves have been BURNING. In detail, I have never felt so much pain in my calves before. In high school I ran both types of hurdles and excelled at them. Jumping and running have always been a part of my exercise. But, for some reason, I can no longer jump with out knotting up after training in FiveFingers. I attempted a backflip off of a boat last week, and both legs charlie-horsed immediately. Mid flip I realized that I would not have function in my legs for the next few seconds. I landed in the water and had to try and float without the use of my legs. This has never been an issue until I started running in these shoes. This should have been a clear sign, but for the sake of my fellow Mudders, I ran in them anyway. They put a whole new strain on your calves, which is why you absolutely must train in them regularly. I clearly can not do this. By the end of the event, I was hurting. I talked to one other runner who was in the same situation as me. Both of us had the energy to finish, but our calves wouldn’t allow it. I’m not saying that the shoes were bad, and in fact, everyone else seems to love them. But at the point I can no longer scale the Berlin Walls when I previously could with ease, I decided that they simply are not for me.