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Adjective: effortful  e-fu(r)t-ful
  1. Requiring great physical effort
    "The effortful climb to the summit left the hikers exhausted"

See also: arduous, backbreaking, difficult, dragging, exhausting, grueling [US], gruelling [Brit, Cdn], hard, heavy, killing [informal], labored [US], labor-intensive [US], laborious, laboured [Brit, Cdn], labour-intensive [Brit, Cdn], leaden, operose, plodding, punishing, Sisyphean, straining, strenuous, tiring, toilsome, wearing, wearying

Antonym: effortless

Encyclopedia: Effortful