( ( While ( ( ( ( ( at least ) 20 ) minutes ) ( of ( ( vigorous exercise ) ( every day ) ) ) ) ( is ( good ( habit ( to ( develop ( since ( it ( ( ( is ( good ( for ( the heart ) ) ) ) and ) ( will ( benefit ( weight control ) ) ) ) ) ) ) ) ) ) ) ) ) ( , ( ( just ( as ( we ( saw ( that ( ( ( small amounts ) ( of calories ) ) ( can ( add up ) ) ) ) ) ) ) ) ( , ( so ( ( can ( ( small amounts ) ( of activity ) ) ) . ) ) ) ) ) )
(ROOT (S (SBAR (IN While) (S (NP (NP (QP (IN at) (JJS least) (CD 20)) (NNS minutes)) (PP (IN of) (NP (NP (JJ vigorous) (NN exercise)) (NP (DT every) (NN day))))) (VP (VBZ is) (NP (JJ good) (NN habit) (S (VP (TO to) (VP (VB develop) (SBAR (IN since) (S (NP (PRP it)) (VP (VP (VBZ is) (ADJP (JJ good) (PP (IN for) (NP (DT the) (NN heart))))) (CC and) (VP (MD will) (VP (VB benefit) (NP (NN weight) (NN control)))))))))))))) (, ,) (SBAR (RB just) (IN as) (S (NP (PRP we)) (VP (VBD saw) (SBAR (IN that) (S (NP (NP (JJ small) (NNS amounts)) (PP (IN of) (NP (NNS calories)))) (VP (MD can) (VP (VB add) (PRT (RP up))))))))) (, ,) (RB so) (VP (MD can) (VP (NP (NP (JJ small) (NNS amounts)) (PP (IN of) (NP (NN activity)))))) (. .)))
While at least 20 minutes of vigorous exercise every day is good habit to develop since it is good for the heart and will benefit weight control, just as we saw that small amounts of calories can add up, so can small amounts of activity.
(ROOT (S (S (VP (VBG Exercising) (NP (DT every) (NN day)))) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (DT a) (JJ good) (NN health) (NN habit))))) (. .)))