Antonyms:

decompress, loosen up, relax, slow down, unbend, unwind

become less tense, rest, or take one's ease

type of:

change state, turn

undergo a transformation or a change of position or action

Antonyms:

loosen up, make relaxed, relax, unlax, unstrain, unwind

cause to feel relaxed

types:

extend, stretch

extend one's limbs or muscles, or the entire body

spread-eagle

stretch out completely

crane, stretch out

stretch (the neck) so as to see better

type of:

affect

act physically on; have an effect upon