Once the coop is built there does not need to be alot of physical labor.
The biggest jobs in chicken keeping are daily food and water, and coop cleaning.
Water can become a chore in the winter, so depending on where you live this could cause you issues. I do not know what your limitations are. Would you have a water source near your coop? Hoses freeze. My family drains the hose after every use by pulling the hose through a high hook. Other people haul water from their house using gallon milk jugs they pull on a sled or wagon. You can lighten the load by getting a large heater waterer, but that increase the amount of strength required for moving it.
Coop cleaning is the next huge job. You might look forward into deep litter coops and runs. This would probably be the least physical solution for you, it allows the waste to decompose naturally, requiring little day to day work.
So solve those two big issues and chicken care is not too physically taxing and very rewarding.