I did my first Couch-to-5K workout completely barefoot today after doing nearly three weeks in VFFs. The running felt awesome, and I didn't have any knee pain or soreness! It was the walking parts that KILLED When I got back I could already tell I had a blister on my left foot, on the forefoot right below my second toe. Another one developed in the same spot on my right foot, and I have a small one on my big toe. Is this just classic TMTS and my feet just need to toughen up (I ran on some really rough asphalt and worn out concrete)?