I find digging holes is beneficial. Unless it's too hot. Or too cold. Or too dry...
If it is a good day to dig I can become totally self absorbed. There is something about the rhythm of crowbar and shovel and rake which I find very soothing. Then there is the satisfaction of a new garden or a new fence or the transformation of a rough piece of land into a smooth area that will later become lawn (or at least mowable)
I try to conquer, or ignore, the frustration of being so much weaker than I used to be. It takes days to do what used to take hours and motivating myself to start is a problem. There are so many obstacles. But, eventually, the digging gets done.
Maybe that's a strange way to get happy, but it's quieter and less technical than my other source of satisfaction, the maintaining of the woodpile. What ever rings your bell--even if it's just a wee little jingle of a very small one. Mxx