The following podcast covers this topic. 36 minutes of time.
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So this community probably skews a bit more on the active side but this topic sent me down a rabbit hole today and here’s what Google AI had to say about it (and what makes sense to me tbh)
“A good fitness score typically falls within a range of 50-70, according to Worked Out Fitness. This score represents a healthy level of fitness that most individuals can achieve with regular exercise and a healthy lifestyle. A score of 30 is considered average, while 70 indicates a high level of fitness, nearing the maximum potential for many people.”
You people who are maintaining a fitness score of 100 boggle my mind.
Are these fitness levels valid for all age groups from lets say 15 - 90 years old ?
Then I have a long way to go , I am only at 32 , VO2max 49.4 (lab testet) 69+ years old 
I thought the same thing. Of course it’s all about how you get there. It’s the original 100 CTL on 10-12 hours a week that really gets me.
100 CTL = 700 TSS/Week or, based on 12hr, that’s 58 TSS per hour equaling 76-77% intensity on average.
That’s not impossible, but a hell of a lot of intensity to keep doing for 6 weeks. On 10hr per week, I don’t buy it. If your FTP is well under-estimated, sure, but not with a correct FTP, let alone with the usualy over-estimated FTP.
Most people will not tolerate that for such a time period.
But if you spread that same load over 20 hours, average intensity needed is about 60%. And that is something that you can build up to in 12-18 months of consistent training. If you have/take the time to build up to that kind of volume, are consistent, remain injury free and motivated, it certainly is possible. Once you can tolerate that volume, you can increase intensity on one or more sessions and keep the same load with less hours.
But don’t forget that all this is in case you use Power. If load calculation is set to HR you can end up with totally different numbers.
You need to take all this with a grain of salt…
Just don’t let anything demotivate you. Fitness is after all just a number representing how much work you’ve done and does not give you any idea about performance.
Do what is sustainable in the time you have available and be clever enough to tackle plateaus by following up and changing your training regime to break through them.
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I can’t remember who said it on which podcast: “The best measure of performance is performance.”
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