letting other people "rent" your physical or mental facilities for a limited time, i.e.-
servicing others with your physicality/skill when they either can't or won't use their own physicality/skill. examples of this would be doing yard work for other people, moving heavy objects, or other physical tasks such as taxi-ing people back and forth into town for shopping/medical appointments-
OR-
servicing others with your mentality when they either can't or won't use their own mentality. examples of this would be doing paperwork [e.g., completing government forms, helping with homework, et al] for folks too addled to do their own paperwork, or who otherwise couldn't be bothered to do such themselves.