Looking for a good microphone

Hi there! Im curious your recommendations for an affordable wireless mic i could use in filming and coaching. Also can tell me the wired mic your coaches use? Do they hook into an iphone too?

Im a pilates instructor adding life coaching into my business model and filming videos that require me to move and exercise as I teach.

Any recommendations would be SO helpful! Im just incredibly grateful for all these programs are offering! My impossible goal is to make 100k and i know i can do it!