[szajbus]

It's probably good rule of thumb as the fitter you are the lower rest HR you have and your heart rate recovery rate is also higher.

[Temporary_31337]

Exactly. Generally the best athletes have very high max HR and low resting HR but by measuring how quickly and how low your HR goes back down after an exercise is a decent indicator for stress, overtraining etc. If your normal rHR is 55 but it only goes back down to 90 after exercise it most likely shows that you are untrained, stressed or overtraining.