strenuous

Adjective
  1. Characterized by or performed with much energy or force (synset 300878543)
    "strenuous exercise"
    similar to: energetic - possessing or exerting or displaying energy
  2. Taxing to the utmost;
    Testing powers of endurance (synset 300841516)
    "his final, straining burst of speed"; "a strenuous task"; "your willingness after these six arduous days to remain here"
    similar to: effortful - requiring great physical effort
    same as: arduous, straining

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