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"