Can I use practice equipment during a round?
I had heard of this, and it came up during a round, so I looked it up. Specifically, can you swing one of those practice clubs during a round. Turns out that you can't.
Rule 4.3a-6 says that you may not use any golf training or swing aid that creates a potential advantage by helping with swing plane, alignment, etc.
You can use something for stretching (including a club), but nothing that would help with your swing.
Interesting...