Okay, the user wants me to translate "stiffen up" into Spanish. Let me think. The verb "stiffen" in Spanish can be "endurecer" or "hacerse rígido". The phrase "stiffen up" is an imperative, so maybe "Endurece" or "Hazte rígido". But I should check if there's a more common expression. Maybe "hacerse más rígido" is better. Wait, the user mentioned if the content is already in Spanish, leave it as is. But the input is in English. So the correct translation would be "Endurece" or "Hazte más rígido". Let me confirm. "Stiffen up" as a command could be "Endurece" (informal) or "Endurezca" (formal). But the user didn't specify formality. Maybe "Endurece" is the most straightforward. Alternatively, "Hazte más rígido" is another option. I think both are correct, but "Endurece" is more concise. I'll go with "Endurece".
Endurece
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