You know how important it is to take a break now and again, but, like me, you probably get engrossed in your work and before you know it hours have slipped by with you hunched over your desk.
I use a wee gizmo to remind me to take a break. This one is particularly for Windows but you can also get something similar to suit Macs. An image, as above, will pop up on your screen and remind you to take a wee break. Read more here. Very simple but very effective.