Meanings

strong legs

hard fight

physical labor

to strain (oneself)

mechanics

test of strength

muscleman

emphasizing (a point, argument, etc.)

help

discouragement

(bulge of one's) biceps

to put effort into

(one's efforts) not being enough

painstaking piece of work

boasting of one's strength

hard fighting

emphasis

lack of ability

to put a lot of effort (into)

strength of the voice