व्यायम्

Etymology
From sa.

Root

 * 1) to pull or drag or draw asunder, extend
 * 2) to sport or dally with (locative case)
 * 3) to struggle or contend about (locative case)
 * 4) fight together, make efforts, strive, endeavour
 * 5) to cause to stretch out or struggle, make great effort or exertion, take exercise