Here's a heartfelt, concise wedding toast for your sister:

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**Toast for [Sister's Name] & Elliot**

"Good evening, everyone. I’m [Your Name], and I have the honor of being [Sister’s Name]’s sibling.  

Most people meet their partner at a party or through friends. Not [Sister’s Name]. She met Elliot at a climbing gym – where else but scaling walls would she find someone steady enough to keep up with her?  

From the moment they started belaying for each other, it was clear this wasn’t just about reaching new heights—it was about building something strong together. Whether they’re conquering cliffs or navigating life’s twists, they’ve always had each other’s six.  

Elliot, you didn’t just catch her when she fell; you chose to climb beside her every day. And [Sister’s Name], you’ve found someone who matches your strength—and your heart.  

So here’s to love that scales any peak, laughter that echoes through every valley, and a partnership as solid as the ropes that brought them together.  

Cheers to the newlyweds!"  

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**Timing Tip:** Practice delivering this at a relaxed pace (~55 seconds). Pause after "steady enough to keep up with her?" for emphasis. Keeps it sincere, avoids clichés, and ties in the climbing theme naturally.