@Greenbank thanks for this! Very helpful advice. I think I was a bit guilty of doing far too short sprints but at max intensity. Sounds like I might benefit from backing off a bit and increasing distance/time of intervals. I can definitely see some sort of watch in my future, even just a basic cheap and cheerful thing for timing would be handy.
I've been using a veeeery basic Forerunner 25 for years and it will do 90% of what you will need, could be picked up for under 30 quid. I do want a 955 though. Need to save some pennies.
@Greenbank thanks for this! Very helpful advice. I think I was a bit guilty of doing far too short sprints but at max intensity. Sounds like I might benefit from backing off a bit and increasing distance/time of intervals. I can definitely see some sort of watch in my future, even just a basic cheap and cheerful thing for timing would be handy.