Of late, he has signed up and been accompanying me to my Kendo lessons (his choice), which has been a good opportunity for some father/son bonding, and also a way for him to improve his fitness and mental discipline.
And that word 'discipline' is a key here. Chores aren't just about slave driving. I believe it is important for young kids to get used to a routine, and to learn that sometimes you have to do things even when it is not convenient. A well raked driveway (outside in the sunshine) should give him the satisfaction of a job well done at the end of it.
Plus it is also necessary, as my wife and I (and his brother) simply struggle to cope with the daily maintenance tasks around the house given our work lives. Him doing chores hopefully also will impart on him that managing a household take a lot of work, and I hope it also makes him see that my wife and I are not just house cleaning and meal preparing robots that just make things magically happen. We have the philosophy that we ALL chip in to make our house a nice place to live in.