Running

What sort of mileage are you guys getting from a pair of trainers?

I’ve been fairly consistent at about 40km a week, 10km of which is typically a speed interval workout, 12-15km of an easy long run, and occasionally a 5km parkrun, otherwise easy runs. I have 3 pairs of trainers and would never wear the same pair 2 days in a row. I’m fairly religious about s&c and every week do a leg session made up of some plyometrics, single leg rdl’s, split squats and calf raises.

Until maybe 2 weeks ago this was all well and good, I had just come back from a weeks hols, followed by a low volume low intensity week to ease back in, but after my first speed workout, a 5k paced 6x800 on the road, my left foot felt a bit sore to walk on. Initially it felt like the pain was along the outside suggesting perineal tendinitis, but quickly shifted to just in front of the heel which I think is plantar fasciitis?

I took a very easy week and it felt fine again, but ran a hard Parkrun yesterday and been in pain ever since, again starting on the outside but shifting to in front of my heel.

Each of the 3 pairs of shoes I rotate are just hitting 300km, and I was wearing the same shoes (ASICS superblast) both times I experienced post run pain. One pair is at 400km but I never push hard in that pair so maybe a combo of shoes past their best and increased intensity?

My volume hasn’t increased, nor has intensity, and my core and legs are strong, so the only thing I can think of is shoes needing replacement, but 300km seems on the low side. That said I am 92kgs so not exactly easy on trainers. I’ve never had pain doing speed or tempo runs in superblast before now.