Is the clavicle burning with too much use of the smartphone? !

I heard that the clavicle will become stiff with too much use of the smartphone.
Apparently the clavicle seems to become more prone to sticking if you use your fingers too much.

I get numb to the arms when I push the clavicle.

After using the smartphone, hold your breath and pull up your shoulders, keep it short, slowly lower your breath while exhaling.
Next, turn the shoulder and we recommend that you flex the muscles around the shoulder.

It seems that throat troubles are likely to occur when the collarbone and neck circumference become hard.
Let's take care of the shoulder and arm, especially around the shoulder blades, in the cold winter.

美ぃLab.（biilab）from Japan　
New function cushion that supports healthy life by adjusting posture Hiijii