I am a touch (normal) typist. Oh so long ago, when I was in the 6th grade, I learned to type on an Apple IIe. This was about 13 years ago but the school was just too cheap to upgrade to newer computers. Anyway, we had to carry around two floppy (these were the real 5.25" floppy discs that you see in museums now

, makes me feel old) discs. One contained the program while another would keep track of our weekly scores. The program would basically split the screen into a lower and upper half. The upper half would display the sentence and the lower half would have a box for us to type in. The program was pretty advanced for the time. It would measure our speed and keep track of it for up to 4 years total. It would also check for any spelling errors.
The teacher was a real hard butt. His class was setup so that the average speed that you could type (for a single week) would be your class score at the end of the semester. This means that you had to learn to type 90 words per minute (the program would count off for spelling errors, each error would subtract 1 words per minute from your time) if you wanted an A-. Despite all my complaining, at the time, the class has proven itself over the years. I know engineers who don't know how to type. This will sit there and use their "hunt and peck" method. It will take them all weekend to type up a 10 word report while I can easily finish that in about 1.5 hours.
I can even use my typing method for touchscreens. I am extremely fast on my QWERTY key Motorolla cellphone and I am even faster on an iPhone/iPod touch. My friends are all amazed that I can type without looking at the actual keyboard.
I experienced an injury only once. It was during my senior year for my BS program in Civil Engineering. I was on my last semester and was taking a total of 18 credit hours. For those who don't know, this is complete suicide. I didn't want to come back for another semester so I just wanted to get it out of the way. Needless to say, my plate was pretty full. I was taking 6 classes and 5 of them had reports due at the end of the semester. Each report needed to be approximately 30 pages in length. That translates to about 18 pages of pure text, it is just stretched out due to proper formatting. 18 pages was a lot when you account for 5 classes, at least two revisions, and having to type up two of those reports again due to a faulty USB thumb drive. I typed all of the reports in a period of two weeks. My hands really hurt after the first week. I had to go to the doctor after the second week as my thumbs were aching.
My main downfall, when it comes to typing, is using a standard cellphone. I don't know how kids can type so fast on those things. I think that takes more skill that using a full QWERTY keyboard. These kids will sit down in front of a computer and barely hammer out 10 words a minute yet they can type upwards around 40-50 using their stupid cellphones.