This is even with many years of hardcore clicking and "worst case scenario" things when playing massive gaming sessions back in the day.
But, one thing I've always done from the beginning is to make sure my forearms are parallel to the floor. I always make sure my hands are well supported on the keyboard[0], and my elbows are well supported (on a chair's arm rest).
One thing that sucks about a standing desk (something I've been using for 2.5 years) is you lose that elbow support since your forearms tend to dangle.
[0] This doesn't necessarily mean resting them on the home keys. I don't know how to type properly and over the years developed my own crazy system. I'm pretty sure if anyone saw my typing, ergonomic is the last thing they would describe it as.