Just read your post. Go 121 right, 545 left, as fast as you can, 100 times. then 232 right, 434 left, same thing. (if it's easy, do less; if you struggle do more) All the way up. Then again 12321 right, 54345 left, etc. Complete the pattern. Might take a very long time the first time, and never need to be repeated.