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Sorry what I meant was, the ride you didn't doesn't really show 'fitness' as using HR to compare stuff like that is not going to really show anything
My threshold is lower now than it was 3 months ago. It's hard to keep fitness all the time unless you just ride all the time then you'll stagnate.
You didn't really say what you're doing so it's not possible to say what you're doing wrong or what you could improve. What's your goal?
Your asking a question that has no answer!
Fitness ebbs and flows and doesn't always grow.
Plus just looking at average watts from a rise against HR shows very little (I'd say it shows nothing but that's not true)
If you want to compare fitness over time you need to do a repeatable fair test.