The Selfloops Group Fitness application allows real-time group monitoring of heart rate sensors and cardio training.
The scope of the app is to make people aware of their fitness performance and to train more effectively when real-time intensity feedback is given.
With this app coaches can monitor their class and train people according to their fitness intensity zones.
This is the FREE trial application. In the trial you cannot store users across sessions and sessions are limited to 10 minutes max. If you like the trial, you can purchase the full version: https://play.google.com/store/apps/details?id=com.sports.wellness.groupmonitoringPlus
NOTE : You need an Android device with USB Host support and Android version 3.0 or higher. ANT+ must be enabled using an external accessory. Recommended devices are the Nexus 10, Nexus 9, Nexus 7, Nexus 6 and Nexus 5. To support the external accessory, you need to install the ANT Radio Service, the ANT USB Service and the ANT Plugins Service. For more info, see our website.
The ANT+ standard is used by Garmin, Wahoo Fitness and many others.