Here is an article in the Charlotte Observer about Bobcats shooting guard Matt Carroll making 184 free throws in a row. Click on the link above to read the entire article. Here is a good excerpt from Carroll about having a routine:
"Shoot as many as you can; the more you shoot, the better you become, plain and simple. You've got to get a routine, no matter what it is. Everyone has a different form when they shoot, a different technique. Whatever your routine, you've got to practice that routine. Don't shoot 50 shots 25 different ways."