I was running in some shite Adidas "running shoes" up untill May this year and suffering painfull legs after my runs lasting a day or 2. So I went to the local Up & Running and was fitted with a pair of Brooks GTS9. It cured me, so I put the pain down to the previous shoes not being right for my gait. My training was fine untill I went on holiday at the start of August, due to that, I didnt train for just under 2 weeks. After my hols, although im still training more than ever, I feel like im going backwards and are starting to get painfull legs after my runs, and now have a slight hamstring strain. I reckon ive put close to 150-200 miles on the trainers, could they have lost their spring and be causing the pain? I also must add I had a mate training with me in July and that slowed me down a lot. Could this be why I feel ive gone backwards?