Jamming — the ancient art of climbing — it was born pretty much as soon as rock climbing was born. If you see traditional routes, almost exclusively they make the use of cracks, and hence jamming is naturally an essential skill. Yet it is such underrated techniques nowadays. Sam Whittaker's word sums it up well:
We Brits climb 5.13s on rainy days. Yes, we really do. Yet when faced on a 5.10a jamming crack we cry. (words from my memory from an article in High magazine.)

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