This is a manifestation of relaxation, because you can try to straighten your fingers, you will feel the tightness of the muscles, and after a long time, you will feel sore fingers. At the same time, finger bending is also the most natural state, do not have to think, the finger will naturally be in a state of bending, and to straighten the finger, you need to give instructions to the brain, and then make the finger straight.
In fact, the rest of our body, when we relax, that is, when the muscles are loose, will show a bent state, and in the time of tension, the muscles are tightened, the parts will follow the tightening, we see is the straight state. If our fingers have been in a straight state, or like the arm has been flat at the end, we will feel very tired, and some square dances are also designed in this way.
? For example, when doing exercises, the whole person is upright state, and then require the arm to also be stretched out flat, this time the muscles should be exerted, in order to make the arm straight, we will see some people do gymnastics breathless, looks flaccid, the arm is bent out, this is the embodiment of his muscles are not hard, can not play the effect of exercise.
And when we sit on the plate, the back is usually bowed, because once upright feel particularly tired, sit on the plate is often practiced in the yoga one, at the beginning if the back is straight really feel very tired, but for a long time, you sit on the plate when the back is straight will feel very comfortable, on the contrary, the back is bowed will not be comfortable.
? In general, it seems that relaxation is the finger bending is a state of muscle not force, if you want to make the finger straight, then the muscle must be force, and for people, relaxation and tension - tightness of these two states are needed, constantly straightening and bending the finger will become a way to exercise the finger strength.