People have more time than they expect. Very few people are working 16 hour days.

https://www.bls.gov/charts/american-time-use/emp-by-ftpt-job...

Note how two job holder average is barely above single job holder average. These are probably people working two part time jobs with a 4-5 hour shift each.

How about activities? BLS has some data there.

https://www.bls.gov/charts/american-time-use/activity-by-age...

Note the leisure column.

Screen time average is about 7 hours a day (not the best source I guess compared to say if apple published their data): https://www.demandsage.com/screen-time-statistics/

You could do a lot of good with a 3 day a week 30 min compound lift strength training workout. Deadlifts, squat, bench press, overhead press, pull ups.