Hello, there is a test in exercise physiology called the Rusko Test. This test effectively can give you a pretty good estimate of how well rested and recovered your body is. The test has you lay flat, relax and comfortable for -10 minutes, then you stand up and stay standing for two minutes. The test looks at your heart rate and how it responds. There would need to be a way to display the results in your Fitbit app via a graph. This test can be useful especially for training athletes but also for the general public alike. Trends can be seen and give insight into sickness statuses or overtraining.
Thank you for your time,
An example of this test can be found here: http://www.ilog.ca/help/Rusko_Heart_Rate_Test.htm
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