We all do it while practicing, sometimes copiously.
In the writing life, the work is 99% perspiration, 1% inspiration
and perhaps, this carries over to yoga. Sweat, however,
in yoga is ascribed to the god Agni and represents the inner fire
in our practice, which is achieved through asanas. Our inner heat
is used, through exertion, to burn off toxins and impurities. This
is far from the American parlance where its connotations
relegate sweat to something gross. We prefer the term "perspiration"
as if it were somehow more pleasant than sweat. Go figure.
Sweat is sweat. In ancient tradition sweat is not only creative,
but procreative as well. One drop of sweat from a celestial being
could bring about a new powerful one. Imagine making babies
with the father wiping the sweat off his brow onto the skin of his wife.
Easy, but sex is way more fun. Next time, you want to wipe the sweat off
while practicing, think again. In medieval yoga, rubbing the sweat
back into the skin produced an inner glow. A new beauty practice,
for both men and women? Not exactly as we all know inner glow
cannot (nor should be!) manufactured.