Hi Sarah- great question!!
Context: I’m 55 yes old, and ride about 10 track days/ year.
In terms of “what is sore”, I’d say I notice it mostly in my core. Trapezius and lats for sure, and also my triceps. My legs seem to be OK, and my forearms aren’t overly pumped, but i know I’ve worked them.
I actually think about this issue in three related silos- cardio, strength, and flexibility. One thing i have learned at CSS is that my lack of flexibility is hindering some of what I want to be able to do on the bike.In my case, its particularly hip mobility- so I’ve been doing some stretching (not as often as I should). Ive also been riding a trainer a bit trying to build up some cardio base. Overall strength, though, I haven’t done much about that…
I’d love to chat with you more about this, either by phone, or in person. LMK