Endorphins are released during sex, just as they are during a strenuous workout.
The first President Roosevelt, the old rough rider, advocated the strenuous life.
strenuous scenes can take a toll on the body over time, thus limiting a career to a certain number of years.
She saw women carrying firewood, and how long it took, how strenuous, and the effect it was having on their health.
Weight lifting: For an activity as strenuous as weightlifting, protein should be screaming through your muscles.
There are, or were, other compensations in a life of trade, which might fire the ambition of a strenuous youth.
Some say, idly, that religion is losing her hold in these strenuous days.
After strenuous labor and many pulls and tugs 234 on the part of the oxen, the car was backed to the road again.
This became too strenuous for him, however, and the line was jerked out of his hands.
He stood up manfully for the cause in which he was embarked, and was most strenuous in his demands for money.
"characterized by great effort," 1590s, from Latin strenuus "active, vigorous, keen." Probably cognate with Greek strenes, strenos "keen, strong," strenos "arrogance, eager desire," Old English stierne "hard, severe, keen" (see stern (adj.)). Mocked by Ben Jonson as a pedantic neologism in "Poetaster" (1601). Sense of "requiring much energy" is first recorded 1670s. Related: Strenuously; strenuousness.