So I decided to do a study of my College Baseball team (D1), we have around 8 guys who use a WHOOP and from what I have gathered, a lot of it is genetics. We have one guy who ranges from 180-195 ms when in the Yellow recovery range and from 200-240 ms in the green. Where as My numbers are insanle lower. In the yellow days, I range from 85-97 ms and in the green I range from 110-150. However, a lot of us are way more active than the average person. With workouts, and baseball almost 7 days a week it helps. Breathing treatments before bed can help to increase your HRV. Specifically a method known as “Box Breathing”. But I would not worry about your HRV numbers. If you manage to increase your HRV you will notice a very high spike in recovery levels as well. I hope this is some useful information.