We used the app to collect data for research and I wanted to know if there is any evidence on it's reliability and validity. It would be very useful if you could let us know.
Ruval Enterprises
Friday, June 14, 2019
Yes, the app closely follows the protocol set out in the document, TRAINING AND TESTING THE ELITE ATHLETE (Jens Bangsbo, et al). It will work well on most devices. I'd recommend the pro version for advanced individual testing and, particularly, group testing.