I'm fairly new to running period, very new to barefoot running. A few months ago a started getting pain in the bottom of my left foot. Internet research leads me to believe its plantar fasciitis. When I run barefoot I don't have this pain. I just can't run far yet so I still run some with shoes. Today, I ran a mile barefoot with no problems. I then ran 2.5 miles with shoes. When I put my shoes on and started running I had instant pain, so I ripped out the sole inside the shoe (Adidas Cross trainer) and had no more issues other than trying to keep my barefoot form. Are the shoes causing me to strain my arch? How? What are some good exercises to strengthen the arch? Thanks.