I've just finished my first week of couch to 5K and my hamstrings are in agony. I'm presuming its DOMS as it started the day after my first session. The 'rest' of me is coping well but backs of thighs hurt with every step. Any advice or suggestions?? I'm really motivated and keen to get onto week 2 but don't want to do any damage. Could it be my running technique or shoes or most likely just the DOMS which will get better with time?