1, be familiar with every fitness tool, or you won't know which tool to use to exercise the muscles there, so it won't work.

2, know how to communicate, generally in the gym, many are rich, don't offend. Of course, even if you are not rich, you can't offend. Communication is also very important.

3, understand the fitness methods, even if you are not proficient, but you must know how to exercise muscles with each fitness tool.