In HS, there is no walking or pivot foot considerations. The rules state that the thrower has to have one foot in or over a three foot wide spot. He can move forward or back. This coach wanted to bet $100. I agreed and he reduced it to a Coke. My partner told me after the game the coach was right, but he didn't want to embaris me in front of the coach. I pulled out the rule book and showed him the rule. Then I pulled out the case book and showed him that too. The next game, I showed the coach. He said his officals had called traveling on him during the season. I'm still waiting on the Coke.
In NCAA there is a rule stating that the thrower cannot pick up a pivot foot.