couch potato (n)

Alex is always a couch potato in the first week of the holidays.
Once an avid hiker, he became a couch potato after a busy work schedule took over his weekends.
Instead of going out with friends, she spent the entire weekend as a couch potato, binge-watching her favorite TV series.
The doctor advised him to break his couch potato habits and incorporate regular exercise into his routine.
As a recovering couch potato, she found joy in outdoor activities that replaced her sedentary lifestyle.