So on Christmas I got a pair of Vibrams Bikila LS's, and have been wearing them around for a week to break them in before I took to working out with them. Today was the test! I ran my weekly sprint(on the treadmill because its kinda nasty outside), and proceeded to lift weights(an upper body day though). I will have to say that I am super impressed with how it felt to run in those. After a few minutes of warmup and about 10 minutes of alternating sprint/walking I had no shin splints, sore joints, or anything...and actually was bounding with energy. I am sold! Not just on the Vibrams, but TPB in general!