Energy Index
The Energy Index is a single, comprehensive measure of your body’s current energy status — how recovered you are and how much energy you have available to spend. Rather than asking you to interpret several separate metrics, it synthesizes multiple physiological signals into one intuitive score from 0 to 100. A higher score reflects a more rested, recovered state with higher energy reserves; a lower score indicates that your reserves are more depleted and that rest may be a priority.
How Reckon calculates it
The Energy Index draws on several inputs that together describe your recovery and energy balance, including your sleep, heart rate variability (HRV), and activity level. Reckon combines these signals so that the score rises as you recover — for example, through quality sleep and rest — and falls as you spend energy through training load and stress. In practice, the index tends to sit highest after a good night’s sleep and gradually draws down across the day as physical and mental demands accumulate.
How to use it
Because it captures both your recovery and your available reserves in a single number, the Energy Index is designed to help you manage your rhythm of activity and rest. A high score is a signal that your body is ready to take on a harder effort, while a declining or low score suggests easing off, prioritizing recovery, or planning lighter activity.
Known Issue:
The Energy Index is still being refined, and you may notice a couple of issues. It often starts the day at 99 and updates very little as the day goes on — rather than trending down in response to training load and stress as intended. We're actively working to resolve this so the score responds accurately to your sleep, HRV, and daily activity.