I have been doing unstructured riding for almost 1.5 years. I have been riding for about 10 to 14 hours per week averaging somewhere between 500-600 TSS/week.
When riding outdoors, I notice that I struggle a lot during headwinds and it demotivates me due to pretty low speed and needing to push more power. My FTP was 300w(4.2w/kg) and it was found through a 20 minute FTP test.
I just came off a 2-week break and currently starting to strength train and planning to do SSB LV this January. I remember coach Chad mentioning that you need to look at base in terms of muscular endurance. Is there any other parameters should I look for?
FYI, I am 19 y/o and my heartrate is around 130 to 140 at my zone 2 but when I get to sweetspot I feel like I can only hold that for a pretty short time.