fun fact: the Thai word for "to exercise" is
ออกกำลังกาย (aàwk-gamlang-gaai)
which, broken into its components, means
ออก "to leave, exit, depart, remove from"
กำลัง "energy, strength, vigor, power"
กาย "human body, physique"
so, literally, "cause energy/power/vigor to leave the body"