I'm also looking into high intensity training. Apparently 15 minutes of HIT can do as well as 30 minutes of jogging
One of the things I like that Strava gives me is a 'Relative Effort' for a session. I think it's some kind of 'HR x Time' equation. Look at these three rides -
Mon, 04/01/2021 - 3:15:08 50.24 mi (157 RE) - 129 Ave HR
Fri, 01/01/2021- 2:33:45 40.41 mi (148 RE) - 132 Ave HR
Wed, 30/12/2020 2:31:49 40.13 mi (217 RE) - 139 Ave HR
The shortest ride apparently took the biggest effort, I guess mainly because of the higher average heart rate. The other 40 miler wasn't that different to the 50 mile ride because of the slightly higher HR. So, have a think about sustainable, high intensity. Sprints are great, but you can't sustain them. My highest RE run is a 10k from last month, 145 RE (ave 150HR for just over an hour). I couldn't really run any further than that, so riding opens up higher RE opportunities (and just the ability to do longer exercises, so more cals burnt) if that makes sense?
I like sprinting but there isn't really a good place to sprint as there's always too many people at my local park and my park would only really suit jogging.
You wanna move 4 miles North mate. We got loadsa space in Barnet

The Spires shopping centre for instance is 5 miles away. I'm wondering if the lockdown rules will allow me to travel 4/5 miles to exercise? Where's a good place to do sprinting and jogging in barnet? By the way Andy, something I hadn't taken notice of before today is that MyFitnessPal says to try and eat only 53g fat a day. Scrolling through my days of dieting, most have over 53g fat, like between 65 and 80g. I assume I'll still lose weight because of my calorie deficit, but is the extra fat intake particularly bad?
Well done.