HRV as a training partner
HRV Viewer is an app made for improving your performance. Take full advantage of knowing your daily Heart Rate Variability so you can adjust your training sessions.
Use the camera of your phone to measure you HRV. Do it as a constatly every morning to create consistent data.
Compare the obtained data with the previous days. Seeing the evolution of the HRV can be an important factor to define that day's session.
Check the advices
Within the app some suggestions will appear according to your values of HRV (comparing them to the previous days)