The plans have been there for a while, but now they are finally put into action:
I bought a set of heart rate monitors in July 2018, along with the Hylofit app. The set can monitor the heart rate of both horses and people (riders).

I will use them while training my own horses, but also plan to offer this service to my riding students and others. Using the monitors can teach me a lot, especially on some specific questions I hope to answer with them. If this leads to any interesting discoveries, I will surely share them with you!