One of the major causes of fatigue is unnecessary stress, and most especially in the workplace. You may find it unbelievable but you can sure shape your office environment into something that would be less stressful. Here is a couple of simple tips:

Prioritize work. Working on multiple tasks at the same time may not actually save time. Perhaps devoting yourself to one task at a time can be better and may mean less revision in the long run.

Try to schedule five minute exercises. There are many �office work-outs� available online. Choose one that would suit your capabilities and needs.