hamstring

I had this great idea that what I really needed to do to run faster was to really focus on engaging my hamstrings when I run. And so at the moment of foot contact, or right before,  I really focused on pulling the foot down and back. And I had a really good workout doing that. And now my hamstring is a bit strained. But I spent today massaging and stretching and getting everything all loose so I think I'll feel better tomorrow.