Rhythm and the hammer throw are inseparable. A good throw needs it and bad throws lack it. As a coach I often have my throwers focus on the the rhythm of the throw as much as any other aspect. But as a thrower training alone, rhythm is something that is difficult for me to focus on in my own throw. Perhaps it is just me, but rhythm seems much easier to watch or hear than to feel. The blur of the throw prevents me from getting much feedback about the rhythm. I can feel when a throw is smooth or easy, but I can tell you little about the rhythm. Harold Connolly told me that at least one of his athletes must have felt the same way so he altered his hammer to whistle as he threw, with the pitch varying as speed increased.
Thankfully I can sometimes get others to come and watch me throw. Yesterday Terry McHugh was once again able to watch me practice and his sole focus was on rhythm. Terry has little experience with the hammer, but he is a talented javelin coach and has a good eye. As with focusing, rhythm is universal and something Terry can help me with as much as any hammer coach can.