Actually, my comment was very much part of the topic. Louis Armstrong had serious lip damage towards the end of his career which many historians believe to be why he started singing more. To be germane to the topic, Louis Armstrong was a phenomenal player and has inspired 1000's of trumpet players however did not have proper technique. The lack of proper technique caused serious damage to his trumpet playing career and therefore is probably not the person to look for when considering effective trumpet exercises. To make it short, OP asked if something Louis Armstrong did was a exercise, instead of just retorting with no, I showed an example of why it may not be a good idea. Sorry I didn't know I needed to be so frank to make my point.