Hi Rachel, thanks for the getting back to me. Yes I could certainly have done the same level of exertion the day after, which is a good sign. I’m using the gps tracking on my very cheap and old phone, so I think it struggles to keep up and has a habit of regularly dropping out and then jumping to catch up.
I feel a bit more confident carrying on with what I’m doing now based on what you’ve said. When I got myself a heart rate monitor and found my heart rate was so high I was slightly concerned that I’d been accidentally going zone 3 the whole time. Perhaps I am just one of those outliers that the MAF formula doesn’t work well for.
Here’s my Strava activity of anyone is interested
https://www.strava.com/activities/5115821647