After a few days rest I got back to the training with an interval session. Nothing too ambitious. Started with slightly longer reps and moved to shorter and faster ones. I focused on my running form. I've been a bit of a stomper since I've got back into things this last year. My stride length is pitifully short these days. I decided it's time to try and get some form. I got up on the balls of my feet and increased my stride and it felt good.