Man getting motivated is hard

First, Happy Birthday!
58 in june. Arthritis in hips knees and low back. Some muscle issues in my legs, getting down on floor and back up is honestly painful. I work at home fixing cars for a living, couldnt do it without a hoist that’s for sure. The past month has been one vehicle, 80 firebird sheet metal work. Im in it for the long haul. Owner is pushing 70 and walks/rides bike every day. He’s in damn good shape. Im putting him to work next week,cleaning and painting floor in car. My motivation, i enjoy it. Lots of youtube videos i watch when i take breaks.