non-dev activity? why any should do activities like that? code only.

I get that is probably a joke but still:

Two woodman had a competition who would chop more wood. Woodman A chopped day and night but still were losing to woodman B who disappeared somewhere each night. Woodman B won. Frustrated, woodman A asked where did woodman B go?

"I went to sharpen my axe!" answered woodman B.

Dont overwork yourself. Take breaks. Unless you have impossible axe that dont get dull. I know I dont.