Harry Very Billy Aps

In a fit rested athlete, the variability between beats in the heart rate is larger than it is in a tired or unfit individual. And i've experienced this exact same thing when i've tested the harry very billy aps on myself. Hundreds of athletes who had tried and then rejected the the use of them because it made em anxiousdhey'd lie down there and think, they've got a big work out to day. They know that they need to get a good test. But what if you're anxious about that workout? That's only going to screw up the heart rate veriability reading. So but excuse me, so much so that i think it pretty much invalidates it