How many people work 7 days a week ?

My Dad worked 7 days a week for years

Military frequently works 7 days a week

I work full time 5 days a week.

If you mean working out, I haven't done that in months. My area has been in lock down since Christmas, and I've been on disability for a month. 

I get some sort of movement in every day of the week including weekends. Movement for me is anything from as little as 20-30 minutes of walking or yoga up to an 8 mile run or hike. I never go a day without doing something, though on the days I just do yoga for 20 minutes or walk my dog around the block for 20 minutes, I don't count it as exercise. Just healthy movement.

Millions of Americans have 2 or 3 jobs to make ends meet.   Every doctor I know works 7 days a week. 

For the past year or so I have worked at least a little bit almost every day.  This fact alone is the main reason I will probably retire next year instead of working longer.