The head physio at one of the UK premiership football clubs has just finished a big study looking at this topic (I am wracking my brain but i can't recall name or club, when I remember or find his presentation I will post it). He performed a pre season screening of all their players (inc academy etc)including sacro-iliac orientation and performance of slump, active knee extension and a number of other strength/flexibility measures. He suggested that the preliminary data pointed to a higher occurence of hamstring strain in players with a relative restriction in neural mobility. He also found that a unilateral posterior (I am going off memory so I may be wrong) rotation of the ipsilateral sacro iliac joint appeared to be correlated with increased incidence of hamstring strain. Regards Steve Aspinall BSc (hons) GSR Sport Rehabilitator Bolton Therapy Centre Bolton UK _________________________________________________________________ Send and receive Hotmail on your mobile device: http://mobile.msn.com