A brief lesson on why it is important to keep your non-strumming wrist nice and straight when you play.
I often see ukulele players holding their ukulele necks with wrists (that's the left wrist for right handed players) at very sharp angles. I can only assume that at some point they decided it was easier or more comfortable to do so. I used to be one of those people. I spent years completely oblivious to how I was holding my ukulele neck.
That is until a guitar playing friend of mine showed me a very simple demonstration which proved to me the importance of keeping a straight wrist:
Hold your hand up in front of you with your wrist nice and straight. Now wiggle your fingers as fast as you can. Done that? Excellent! Now do it again but this time bend your wrist sharply so your hand is 90 degrees to your forearm (it doesn't matter which direction you bend.) Wiggle your fingers as fast as you can. Do you notice the difference? The fingers move with far greater ease and efficiency if your wrist is straight.