The Hand As Sack Of Bones Question

Hi Alan- If i understood correctly,whenever I am using the hand a "sack of bones" I am dissolving and letting go the hand's structure,so does that mean that the motion of hip joint of the hand rising does not exist even the slightest? I need to press the keys down without feeling the elasticity of the rising up motion of the MCP? Same thing goes to sliding in at the moment of playing, and keeping the finger flat,if I lift the MCP then the arch is rising ,but what if i dont want to rise up the arch,does the function of the MCP rising cant happen in this case? Thank you!

Fascinating question. The MCP joint can indeed rise in a "sack 'o bones" hand. But: can it do so while your hand maintains the "sack 'o bones" quality? Yes it can - see if you can find the way. AFF

Is it a reall standing up motion of the MCP or,having tonus in the fingers so that it does not collapse? Aming,if for instance, I am sliding in and want to keep the palm of the hand on the surface of the keys,making the MCP stand up will keep the palm off the keys...no?

I am trying this out on the table as I type. I make my hand a sack of bones. I flex the fingers a bit. The hand loses the sack of bones quality IF MY ARM DOES NOT RESPOND. If my arm moves forward in instand response to the inner activation of my hand, it can retain the bag of bones quality even as it comes to stand somehow. AFF

Using the hand in sliding in and out of the piano ,the palm is on the surface of the keys-the sliding can be considered as replacement of the elasticity of the grasping motion of the MCP? I wan to keep my the palm on the keys,so bringing my arm in and out is the elasticity and the free sensation the whole body needs in order for it not freeze up,correct? The MCP does not actually rise in all tone colorations,there are times it has tonus but not standing up,correct? -I am asking cause i saw a lot of the videos on the website of sliding and keeping the palm on the keys or another example, playing a Mozart playing portato or making an accent ,the arm was dropped and finger rested on the keys without any grasping motion,so i wanted to make sure that i understood the concept of the MCP rising Thanks

Yes, the MCP does not always rise. But the force that would make it rise is most always present within. AFF

OK,I think i understood that concept ,thank you! I saw a video on the website explaining about elastically loading the muscles like a sling shot,but how come flexing the last two phalanges of the fingers and using the extensors by lifting the fingers does not inhibit the movement if both group of muscles are contracted it should make the movement harder ,no? Also ,is it possible using that technique playing really fast,same as using the fingers in their more natural curve? Thank you

It depends. At this point I can't really answer the question online. It is a good question. You have to try it out. AFF