>60 years ago, your grandfather's generation had no problems with this at all. They didn't go to the gym.

My grandfathers generation got a lot of daily exercise. My grandfather was a farmer and was on his feet for 10+ hours every day.

>Huh? The only way it increases his mental well being is that he believes that if he doesn't meet some abstract ideal he'll have failed

?? Regular exercise has dramatic effects on stress levels and general cognitive ability.

> My life's quality is already pretty high. What is it that I'm missing? Being able to hike up a mountain?

You can have an amazing quality of life without ever reading a book after high school...

You can have an amazing quality of life even if you are born paralyzed from the waist down...

You can have an amazing quality of life if you are deaf or blind...

You can have an amazing quality of life despite being in massive debt...