AV Now has helped both of the clubs that I work for with their mic set-ups. It really depends on the portability that you want, and the number of hours you want to be using it. Sweat is a factor for wear and tear, and most of them are measured in hours of use per week.
If you are looking for a portable system, I use a Hisonic HS120 system for my outdoor classes and pool classes. I occasionally use it inside as well if the sound system is down. Light weight compact and decent sound. It has bluetooth as well. Only about $100 on Amazon.