Another place people go wrong is not having their elbows or hands (depending on which plank you’re doing) directly underneath the shoulders allowing the arm or upper arm to work as a column.

a rye and coke, on ice, maybe two or more. : )

I've had a similar positive experience w/ Flux. Have it on my laptop and Desktop

For a couple of years now I've used f.lux http://stereopsis.com/flux/ which alters the screen of your Mac from sunlight-frequency to indoor-light-frequency, localized to your locations sunrise and sunset. It could all be placebo — but I noticed a pretty clear effect, in that looking at the computer didn't keep me from…