This is for a part-time gig. I charge a set amount per month up to a max number of hours worked. If I work 1 hour or 10 it doesnt matter. Usually I only work 2.5 hours a month hence the high hourly rate.
Not always at medium-big startups. It is fixed depending on the position.
I have worked at like 6 different companies now from 20-1400 people. Smaller companies definitely have some flexibility but its usually a cash vs equity conversation.
You can try to negotiate but the options bands are usually predetermined and approved by the board of directors. Trying to get an exception passed through can be difficult and usually only for leadership positions.
Totally anecdotal, but speaking as someone with Anxiety Disorder + occasional intense panic attacks, once I started Rock climbing heavily and Trail running 2x a week, my anxiety and Panic attacks basically went away completely.
This was following years of taking 5HTP, meditating/breathing, talk therapy etc, which helped somewhat but nothing like intense exercise.