Lock to side.

A lie on spine, under waist are rolled towel, bended legs in knees under straight corner, feet are on floor, under head is stand of books, hands stretched up, wrists are crossed to lock, do not opening fingers,stretch theirs to side, as in this a same name a hand bending,and opposite straightening out, and on etc to repeat a move to opposite, as here are two variants for exercise,as isometric with incline out lock of fingers to side and keeping pose within 30 sec, after returning back, and wrists are inclining out to opposite side,keeping theirs on new pose within 30 sec, repeat exercise for three times with a rests for..
Dynamic as inclining out a lock from fingers to the side and keeping his for three sec, and after move to opposite side and keeping also for three sec, as on edge pose,repeats are 15 times.