bad typing habits

I just discovered that I always use the left "Shift" key.

I also use only the left "Ctrl" and "Alt" keys on Kinesis keyboards, and only the left thumb to hit the "Space" key on regular keyboards.

I realized this after changing my Unix password; two days later, my left hand and wrist feel a bit strained. I'm pretty sure it's because my new password requires me to hold "Shift" while typing a letter on the left side of the keyboard.

I'm now trying to force myself always to use the "Shift" key on the opposite side from the letter that I'm trying to type, but it's proving to be surprisingly difficult.