hard time getting motivated

Like Myron said it is good for you , not only the physical part , but the mental part.
In the last 5 years, I built 2 race cars, a truck and Rebuilt my Duster from a Drag car to a street car with a 4 speed. Not including fixing many lawn mower, tractors and tillers for people. I was dealer line mechanic for 15 years , worked in many garages. I am 54 and enjoy now more than I did before. I have taught my self to mig weld and paint. Best thing to do is work on it little bit each day or every few days, just don't make it chore, it is suppose to be a fun hobby!