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@ewanmac
I still find it useful to think in terms of %FTP even when I’m riding on feel.
100% FTP is my absolute best effort over an hour (or 25mile TT)
110% FTP is a bit harder than that and is my 10mile TT effort.
90% FTP (sweet spot) is a bit easier than 25mile effort, it’s hard but sustainable and is pretty close to 50mile TT effort (or 2hr best effort).
I do have a power meter so I have the advantage of having learned roughly what each of these zones feels like but it’s now only fitted to one bike (TT) so most of my training is done on feel with occasional cross checking with power data.