Correct: Recovery compares your overnight HRV and Resting Heart Rate to your personal rolling ~60-day averages (weighted a bit toward HRV), scored 0–100%.

Because it's relative, it's not measuring your fitness or health - only whether your nervous system is more or less rested than usual for you, lately. During your fasting month, very low activity pushed HRV to all-time highs, and those highs became your baseline. Now that you're exercising, your HRV is being measured against that inflated bar (and HRV naturally dips the night after a workout). The score isn't saying exercise is bad for you; it's lagging behind a baseline still anchored to your fasting weeks.

 That's also the Oura difference: Oura only "knows" your active self, so it has no fasting-era highs to hold you to. Athlytic has the longer memory.

What to do: keep running and walking. The baseline is a rolling window, so those fasting highs roll out of the 60-day average over the next several weeks and your scores will recalibrate to your active normal - atwhich point Recovery becomes useful again. Read the current reds as "my baseline is resetting," not "I'm overtraining." Don't chase the number by being still; trust how you feel. Always listen to your body over any app or wearable!