arduous, demanding, exhausting, vigorous; see active 2, difficult 1. See syn. study at active.
"strenuous." YourDictionary, n.d. Web. 14 January 2019. <https://thesaurus.yourdictionary.com/strenuous>.
strenuous. (n.d.). Retrieved January 14th, 2019, from https://thesaurus.yourdictionary.com/strenuous
Marked by vigorous physical exertion:
Possessing, exerting, or displaying energy:
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