UKC

Do holds with moving parts exists?

Moving parts as in some sort of mechanism change within the hold that affects how you interact with the hold

E.g. the hold gets steeper or the grip style changes the longer you stay on it

No

Great idea though, 3 second jugs to stop you milking rests. 

There are holds that spin, but I am sure it is not deliberate.

The closest thing you might find to that would be in the novelty climbing centres like Clip 'n Climb.

(Or some of the sketchier sections of Gogarth!)

There is at least one company that makes rotating volumes, I haven't seen any regular size holds that rotate or pivot deliberately though. 

Know a crag that is loose and polished at the same time. Combining the best of the worse

Unless it's something that is very obvious and not sudden it sounds like a route to injuries pretty quick

Those walls where the angle changes look a good idea tho never had a go on one

Swinging holds exist in the more extreme tooling gyms. Logs or wooden speres on ropes, etc.

What about holds with spinning saw blades and volumes that breathe fire?

Some gyms have rope swings between 2 walls. If you ever see one please light the end and run off, that’s the sort of place that has climbers like that ‘captain cutloose’ fella swinging all over the place and dynoing every move for internet clout and not actually climbing. 

Here's Louis bouldering 8B in Magic.  youtube.com/watch?v=dBLg7P2JJoI& 

If that's 'not climbing' then based on your profile we can downgrade everything you've ever done to 'hiking'. 7a/E4 is an absolute path compared to that. 

Let people enjoy things! 

Agreed, Louis is a wicked climber who seems like a top bloke and likes to have a laugh whilst he's at it!

Can't see why someone would have an issue with that!

Almost there, those nasty yellow jugs at Kendal wall. I am sure there is an angle grinder spinning in the back of each one with the way they leave your skin feeling. 

Jealousy, isn't it. Simple as. 

Anybody see images of those phallic shape holds that were kicking about a while back. Maybe they should get a load of them for the Mini Works in Sheffield

Well, I have seen those conveyor belt type contraptions that slowly get steeper as you climb the same rotating set of holds. They're quite fun but the novelty quickly wears off. 

Try some of the Peak district routes. Just been on a route where the jug turned into a sloper and then an undercling. It fell off completely after this orientation, but the gap it left was suitable for a hand jam if your hands are large. 4 different types of hold from one small flake. Can't ask for better than that.

360 holds makes a massive rotating volume. http://www.360holds.com/en/Online-Store/VOLUMES/SPINNING-VOLUME