Well...when Link uses his sword he has to move his arm in a vertical, horizontal or diagonal motion. When making contact with an enemy, he either pulls his balde out of the enemy or pushes it further through to try and kill the enemy. When he is pushing the sword through or slashing away he is using muscles or "Strength". In the end, it depends on your definition, sometimes like in the Shadow Temple or in the part where you get the lens of truth in Majora's Mask, there was no need for strength, you just had to have the courage and you needed to beleive. It seemed like a bottomless pit and hell, for all we knew it could have been but to save the world, Link took a gamble and jumped.

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Beautiful Signature by Necco