I just got back from a 3 mile run. Normally on the sprint up the last hill my legs hurt, but it was pretty painful from the off. Not agony but enough for me to wince, ooh and ahh all the way around. Not even sure it's shin splints, the left shin feels like it's shattered? 30 mins after it's still a bit weird. But my calves feel like their concrete blocks. I didn't stretch til after the first 1.5. Maybe that's to blame? Ive only ever trained on the pavement and I think I'll start mixing things up with the track and field. When running on grass should i stick to trainers or invest in some football boots?