For example, I could cook and clean and such for eternity. Provided, of course, that there would be no ecological or economical strife and no pollution in getting the ingredients and fuel and pots and all things necessary.
I'd also work in the garden and field, starting early, finishing late - I have absolutely no problem with imagining doing this for eternity. And since I would be doing it for all eternity, I wouldn't age or become ill, and always have some level of fitness for being able to work.
I would be absolutely fine if eternity would be just like this life, but without the aging, illness and death in their various forms.