I've been running for over 30 years with very few problems except occasional plantar fascitis. My weight and running routes haven't changed in the last 5 years or so.

However, I've recently run into (pun intended) something that has me puzzled. For many years, I just replaced my shoes when my left ankle was sore after a run. With my last pair of shoes (Asics DS trainer, a model I've been using for a 2-3 years), the old reliable signal didn't come on. However, my legs and particularly my knees were sore after a run. I looked at when I had started using the shoes and decided that they were probably the reason.

So, I went to buy a new pair from my favourite shop. No luck since they didn't have my size. Bought New Balance 826. I've used the 825 before without any problems so thought this should work.

Result? Legs were almost as sore after my first run as they'd been with the old shoes.

So, do I ditch the NBs and find another pair of Asics? or is there something else that's going on here.