Except for occasional sore fingertips, any kind of pain you feel while playing must be taken as a serious warning sign.Musicians who maintain improper postures and unnaturally stress their fingers, wrists, elbows, etc. risk developing "Repeated Strain Injury", a painful and incapacitating condition that requires medical attention.
Here are a few things that can help you avoid trouble and enjoy hassle-free playing throughout your life:
Try to be as relaxed as possible at all time.If you notice any tension while practicing, stop for a moment, relax,
and stretch gently before continuing.
Take regular breaks. You will also learn more by taking short breaks from time to time rather than going on pauselessly.
A good playing posture is not only healthy, but it will also help you play better, faster, and with more feeling.
Straight back, relaxed shoulders, regular breathing and a wrinklefree forehead are part of good posture.
If you play standing for long periods, your guitar strap should be as wide as possible, to distribute the weight on a larger area of your shoulder and back.The inside of the strap should also be kind of rough, to prevent it
from sliding, pulled by the weight of the instrument.
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