Light-Exerting up to 20lbs/9kg of force frequently, and/or negligible amount of force frequently constantly to move objects.
Sedentary-Exerting up to 10lbs/4kgs of force occasionally, and/or negligible amount of force frequently or constantly to lift, carry, push, pull, or otherwise move objects, including the human body. Sedentary work involves sitting most of the time.