I dunno - it just happens

How can a wasp fly?

The question is a 'how' question, asking about means and mechanisms. One answer would be to explain about wings and muscles, body fluids, centres of equilibrium, the physics of aerodynamics, and so forth. These biological and physical explanations are ones many people can agree on, although they do not explain how a wasp, in-itself, is able to fly.

How can I lift my legs to walk? Once again, I can give physico-chemical explanations involving, muscles, energy, etc. However, they do not explain how I - me in-myself - am able to lift my legs and walk.  

Those scientific explanations represent a 'view from nowhere', a universalised and objectifying perspective. That is valid, as far as it goes, but it is not able to explain my experience of walking. For the act of walking or running is something directly experienced by me, and this experience is prior to, and underlies, my experience of walking understood as scientific information.

I have lifeworld information given by experience that is prior to the world understood as objectivised information.

How can I lift my legs to walk? "I dunno - it just happens!" If I am unsatisfied with that answer I now have to start investigating my experience of myself as agent. This will yield a different kind of explanation of how I am able to move my legs purposefully in order to walk.

One thing's for sure: I know that I am embodied will-to-walk.