While I was mostly joking with my comment and the context of having to bike to work in a hot climate.

I agree with you initially, that works starts when you’re ready to work. I think that definition of ready is a little subjective.

As far as I’m concerned the moment I deviate from my normal non-working behavior is when I am starting work.

Realistically I feel that begins at the commute to work for me, I have some personal bias here since I have an hour long commute when I do (I work from home a lot of the time, so again that also skews my perception of when I “start” work.