I am a huge fan of Mike Rowe, the host of a TV show called Dirty Jobs. The show features Mike going to work for a person with a job that most people would think are terrible jobs. Mike then learns about and helps collecting garbage, emptying septic tanks, making charcoal, etc. He generally sucks at the job, gets covered in something dirty and/or smelly and makes a bunch of sarcastic comments that end up being pretty funny. The show ended up running for years, and Mike completed 300 different Dirty Jobs.
A strange pattern became evident to Mike. He realized that the vast majority of the folks with Dirty Jobs were the happiest people he had ever met. He is now an advocate for getting more people into skilled trades.
Below is a poster that I think ties in with the do 100 things concept. It advocates both working hard and smart, which to me seems to be a perfect description of permaculture done well. If you are smart and observe how nature works, and then combine that smarts with the hard work of getting the systems established, you end up being happier, and the system requires less work to maintain than to create. To me, life without working hard seems to have less purpose, and my favorite things to work on are things I WANT to do, not things I HAVE to do, but you often need to do the haves in order to afford the wants.
It is really strange to me, Mike's focus has been on trade skills, but the truths he has figured out must be something close to universal truths, because they seem to correlate directly with permaculture as well.
I could go on for a long time on this topic, but hopefully somebody finds this connection interesting or helpful.