definition of
strenuous

[1] #1 strenuous s. characterized by or performed with much energy or force; "strenuous exercise". wn

[2] #2 strenuous s. [arduous, straining] taxing to the utmost; testing powers of endurance; "his final, straining burst of speed"; "a strenuous task"; "your willingness after these six arduous days to remain here"- F.D.Roosevelt. wn