Which book? TftNA or TftUA?
Are these separate sessions or they refer to the same thing? In other words, if I’m doing weighted hill climb in zone 1, does that constitute one of the “long zone 1” session”
Separate. In an ME session, heart rate may be low, but the local intensity in the legs will be high. Because of the latter, it counts as Z3, not Z1.
Another question is on recommended percentages. Do these account for only aerobic sessions or everything is included, such as strength sessions and climbing?
Usually, it’s everything included. If you can reference the book and page number, then I can take a closer look. The only volume that may not be included might be technical climbing practice. But again, I can look and confirm if I know the page number(s).