Light in these sentences means a body not heavy, lightweight, or sounds like a light such as light in the lamps?

Question

He feels light in his body whenever after the relaxing practice.

He feels his body light whenever after the relaxing practice.

Answer 1

light as in less weighted down, less heavy.  "whenever after" the practice though, does not work.

I would almost think of it as a metaphorical use of the term light, as in feeling less heavy is not actually being less heavy.  It is an easing of a feeling of being burdened, perhaps.  Exercising lifts away the "weight" of his routine existence.  It does for me, too, actually.  I might be tired, and even feeling a bit weak, but my troubles are gone.  I feel good even if exhausted.

Of course, it might also mean literally feeling light.

Answer 2

Not heavy or less heavy.  It’s an adjective, not a noun.