strenuous

/'strenjuəs/
Adjective
  1. 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
  2. characterized by or performed with much energy or force
    • strenuous exercise

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strenuous
He completed a strenuous hike up the mountain trail.