( ( By ( disabling ( ( the movement ) ( of ( the ( antagonist muscle ) ) ) ) ) ) ( , ( ( the ( agonist muscle ) ) ( ( is ( allowed ( to ( move freely ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN By) (S (VP (VBG disabling) (NP (NP (DT the) (NN movement)) (PP (IN of) (NP (DT the) (JJ antagonist) (NN muscle))))))) (, ,) (NP (DT the) (NN agonist) (NN muscle)) (VP (VBZ is) (VP (VBN allowed) (S (VP (TO to) (VP (VB move) (ADVP (RB freely))))))) (. .)))
By disabling the movement of the antagonist muscle, the agonist muscle is allowed to move freely.
(ROOT (S (NP (JJ Intrinsic) (NNS muscles)) (VP (VBP allow) (NP (PRP$ your) (NNS fingers)) (S (VP (TO to) (VP (ADVP (RB also)) (VB make) (NP (NP (JJ precise) (NNS movements)) (PP (IN for) (NP (NNS actions)))))))) (. .)))