Well fatigue and exhaustion are different, which I think you was hinting at. You get fatigued from running, but after 5 minutes rest you're able to run again. I

Well fatigue and exhaustion are different, which I think you was hinting at. You get fatigued from running, but after 5 minutes rest you're able to run again. If you're exhausted from running a marathon, 5 minutes after you've finished running you're lucky if you can stand up again. I experience this fatigued problem regularly, I go from doing heavy hands on work as an electrician and when there's an ebb in the work I used to do little exercise as I'm used to getting more than enough whilst working. I go from 6 hours sleep to feel completely rested to sleeping 10 hours, on a good day. I also end up being unable to do any writing or any other work. I recently found an old set of light weights and simply keep them next to me, I do about 100 reps per arm and afterwards I feel completely energised. After a few days I was even back to sleeping 6 hours. It seems odd that doing 20 minutes infrequent exercise through the day, like when I'm stuck on an idea, gave me about 4 hours extra time without feeling fatigued. So I'd say dig up some old weights or buy a cheap pair of 5lbs and you're sorted. You'll end up with even more time in the day and you'll be more productive. Ironic that the more time you spend exercising, the more time you get back.