[lkbm]

Exercising is straining, but I'm planning on doing a 60 mile bike ride tomorrow, purely for the enjoyment of it.

Meaningful work and a sense of accomplishment doesn't seem like it's caused by a culture of shame. I can get that from a hobby (painting, writing, programming, carpentry), or I can get it from a job (painting, writing, programming, carpentry). In either case, it seems normal beyond the boundaries of culture to derive satisfaction from this.

It might be a lot harder to derive satisfaction from hobbies with no "productive" output (my long bike ride, hiking in the woods) due to a culture insisting on productivity, but I don't think it's true that the productive ones would be valued less than non-productive ones if not for enculturation.