Potential answers for "Strenuous effort"

⭐⭐⭐⭐ ELBOWGREASE
⭐⭐⭐⭐ TOIL
⭐⭐⭐ ALLOUT
⭐⭐ TREK
⭐⭐ ENDEAVOR
⭐⭐ TRIS
⭐⭐ LACTIC
⭐⭐ TIRING
⭐⭐ HARDWORK

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