Stealth Yoga, Defined

Stealth Yoga:
Yoga practiced in one's office at work, with door closed and lights off.
Necessitates: changing in one's office (ooo--risque!); modifying sun salutations so as to avoid smacking bookshelves; ignoring knocks on door; and omitting headstand for fear of falling, hurting oneself and needing to cry out for help, so revealing that stealth yoga had been practiced by one increasingly aged and infirm.