( ( ( ( ( Stand erect ) , ) ( with ( ( both arms ) ( ( ( extended downward ) , ) ( tense ( ( the muscles ) ( of ( the ( upper forearm ) ) ) ) ) ) ) ) ) , ) ( ( hand ( ( ( ( extended and ) ( ( raise ( the ( right hand ) ) ) ( to ( the shoulder ) ) ) ) , ) ( ( resisting ( ( the ( biceps muscles ) ) ( in ( the ( upper arm ) ) ) ) ) ( by ( the ( triceps muscles ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Stand) (NNP erect)) (, ,) (SBAR (IN with) (S (NP (DT both) (NNS arms)) (VP (VBD extended) (ADVP (RB downward)) (, ,) (S (VP (VBG tense) (NP (NP (DT the) (NNS muscles)) (PP (IN of) (NP (DT the) (JJ upper) (NN forearm))))))))) (, ,)) (VP (ADVP (NN hand)) (VP (VBD extended)) (CC and) (VP (VB raise) (NP (DT the) (JJ right) (NN hand)) (PP (TO to) (NP (DT the) (NN shoulder)))) (, ,) (S (VP (VBG resisting) (NP (NP (DT the) (JJ biceps) (NNS muscles)) (PP (IN in) (NP (DT the) (JJ upper) (NN arm)))) (PP (IN by) (NP (DT the) (JJ triceps) (NNS muscles)))))) (. .)))
Stand erect, with both arms extended downward, tense the muscles of the upper forearm, hand extended and raise the right hand to the shoulder, resisting the biceps muscles in the upper arm by the triceps muscles.
(ROOT (S (NP (DT The) (NNS triceps)) (VP (VBP help) (S (NP (DT the) (NN body)) (VP (VB extend) (NP (DT the) (NN arm))))) (. .)))