Characterized by or performed with much energy or force.
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
characterized by or performed with much energy or force; "strenuous exercise"
taxing to the utmost; testing powers of endurance
characterized by or performed with much energy or force