As I have been self coaching this year, I have been doing lots of reading and analysis of my numbers, and have some observations. As I am getting fitter and faster, my FTP and LTR are improving, so an hour run at 5m/km used to give me a TSS of 75, now gives me a TSS of 50 (or less), same with the ride - you could say, just run or ride faster, but I guess like most, I have set run and bike routes, so am getting a lower TSS for the same route than I used to get.
As I ride to work 3 times a week, I get a base TSS of 400 per week, which makes a big difference for building a decent CTL. I also have a pretty consistent training schedule with certain activities on certain days, I think that my body responds well to routine
From Jan to March, I put in a lot of effort building CTL from 60 to 130ish - most of that time my TSB was in the range -25 to -35 (occasionally lower), which one could ague was over training, but most of this was lots of zone 2 miles on the bike, and didn’t leave me feeling too tired. since mid March my CTL has fluctuated between 125 and 135, but TSB has been -10 to -25, with a week over Easter where it was positive. Even last week, where I had a massive week, my TSB only dropped to -42, while my CTL went up to 141.
Ironically I feel more tired in the past month, where my CTL has been stable and TSB lower, as I have been doing more tempo work, zone 4 efforts and some races
I think that I will go into 70.3 Austria in 2.5 weeks time with a CTL around 120 and TSB of +20, but will be living off that bank of fitness that got me to a CTL of 141