Recently been reading up on Heart Rate Variability and I am greatly interested in getting started myself. Only one problem, the price of the app and its phone connecting accessories total over $100 and are too far out of my price range. I was wondering if you can just record the heart rate the old fashion way and calculate the averages yourself.
If this works how many BPM more than usual means you should take the day off, how many to take the day light, and how many means your good to go?
Cheers in advance to anyone that can help me out.