Something I’ve always struggled with is the best way to measure progress over time with just one metric. That is - currently progress is best measured by some mix of FTP improvements and TSS increases, but you really need to do some juggling between the two in order to see overall fitness going up. I’d rather just measure an increasing amount of work over time (which could work as an OK metric as long as I’m not just ramping up hours), and one idea I had is that rather than constantly measuring my work against the FTP I have, measure it against some sort of long term target / FTP I want.
For example - let’s say I want my target FTP to be 300 by the end of the season, but I’m at 220 now. I can put in 300 for my FTP in TR, and then all of my monitoring for the season will show progress relative to that number. So an hour of Sweet Spot at 90% of my “real” current FTP would only be like 0.67 IF versus my system 300 FTP (220 * 0.9 / 300), but then if I improve and can do an hour of Sweet Spot at a real FTP of 250, that’s now an IF of more like 0.75 (250 * 0.9 / 300). So in this case I can just see that my TSS went up from 67 to 75, and know that I’m getting fitter.
So using this metric - I’d look to see a season-long increase in TSS, which could be meaning either I can do more work at a given level of fitness, or my level of fitness goes up. This seems to normalize across the debate of “what’s better, high FTP or being able to hold that FTP” which always felt a bit meaningless to me - both seem like different ways to skin the same cat of going faster for a given period of time.
Thoughts on either this approach, or another way to measure progress with one metric?