Mymic - Portable Personal Sweatproof Wireless Headset Mic System with – YesMic.com - Fitness Audio Systems
Wireless Microphone Headset, UHF Wireless Mic Headset and Handheld 2 in 1, 160 ft Range for Voice Amplifier, Stage Speakers, Teacher, Tour Guides, Fitness Instructor(Do Not Support Phone/Mac/Laptop) - Walmart.com
EVO-E Water/Sweat Resistant Cableless Headset Mic & Pocket-Sized Wireless Receiver Mic System - Galaxy Audio
Fitness Instructor Microphones
Amazon.com: Shure SM31 Fitness Headset Condenser Microphone with Moisture-Repelling Hydrophobic Construction for Workout Instructors, TQG connects to Shure Wireless Systems (Bodypack Transmitter Sold Separately) : Musical Instruments