As far as "pliable hands" go, follow the link and I'll let Ron Avery explain it.
https://pistol-forum.com/showthread....=Pliable+hands
As far as "locked wrists", it's kind of a bad term as it doesn't really tell you anything useful. A more accurate term would be "static orientation of wrists". Basically the concept is that you keep your wrists in as static a position as possible through the gun's operation.
Take for example doing a bicep curl. When you grab the weight to curl it, do you let your wrist flop about with the weight grasped in your hand as you perform the curl with your bicep? No. You keep your wrist in a static formation to better control and handle that weight. It's the same concept with a gun recoiling. Except that your arms are supposed to be stationary and the gun is the one doing the moving. There's no magical "locking point" or "feeling of a lock" in your wrists, just a static hold on those joints. Having your wrists bent more forward or away from you helps in keeping those wrists "locked". Extend them too far and it can get fatiguing.
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