Really nice interview by Simon Carter with Aussie Chris Webb Parsons:

Oh, my thumb. I use it like another finger. When I first started climbing I was reading about how to get stronger, about finger boarding etc.
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I figured out that there was a lot of strength in my thumb and I remember sitting in school, my maths class, and I was just mucking around on the edge of the desk and I was playing with my fingers and I had my thumbs on the edge of the desk and I was like I wonder if you could use that as a crimp?
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So I began twisting my thumb and really stretching them, every day, stretching them. I remember they were really hurting. But I just kept crimping the edge of the desk and began to use it on certain holds.
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