I thought this Feldenkrais lesson might be useful for runners with tight hamstrings. It's a 32 minutes audio file - sorta like a short yoga class.
Requires your undivided attention, and a clear space where you can lie down.
http://openatm.org/atm/Hamstring_ATM.mp3
For a list of all the free recordings, including many that are particularly good for relieving back tension and pain, see:
http://openatm.org/recordings.html
Happy New Year!