For me I would say just move! Trying to figure out what this mythical Grok may or may not have done seems fruitless. He may have walked for one whole day with only some dried berries then found a good game source and not done much for a week. Or been happy in his forrest hide out eating bugs all day with the old lady by a nice waterfall and swimming lake. Make up what ever you like... for me the key is to do some form of moving everyday..and more than rolling out of bed and into a chair! LOL
Walking and occassional more stressful sprint and some weight training is what I like.
Living the dream, inside a myth