Can you teach a Rhino new tricks?

The Rhino in question is me. I am trying very hard to run the way Greg tells me I should. I am a heel striker. Heal striking is bad. Today I went for a 2 mile run with Rich. He ran in his 5 fingers and I ran in my Chuck Taylors. I was not heel striking. If you heel strike in Converse it hurts. While Rich has very little issue running in the appropriate manner, I sound like a Rhino coming. THUD, THUD, THUD! He tried very hard to get me to run in a softer manner. Honestly, it is like putting ballet shoes on a rhino... you still hear: THUD, THUD, THUD.