While this is generally true, there are different types of auras. The energy of the aura may not always be beautiful, admirable or interesting. I mean energies that are more protective, powerful, mysterious and that people will be a little more shy of but still admire.
A strong energy flow does the same. Being physically active in a consistent way and in the right amount helps with a strong energy flow among things. That's why athletes are universally liked, why very sedentary people are considered the least attractive.
Walking doesn't count as physical activity unless you are a whale
Sedentary lifestyles lead to energy stagnation and low energy levels among other health issues.