When I first started squatting, I had my feet at a neutral angle. I squatted and got a good bit of hamstring pain, and it was suggested that I "toe in" a bit. I did the next week with my feet straight forward, and had to take the week after that completely off because my knees hurt all week. I went back to the neutral angle today, and, surprise surprise, my hamstring pain is back in full force. Here's a video of one of my warmup sets, is there anything visible that I'm doing wrong? Getting sick of this
...my apologies for the background music, as well as the sideways video.
http://youtube.com/watch?v=lCi8Q1QtL9c