This topic is a hot debate in a different hobby i do.
This article is over a year old, but this is one of the discussions going on. Im posting it to further better discussion.
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Notice he cites an article that points in the opposite direction at the end of his blog. Do some linksearching before writing here, i think we can really get a good discussion going.
Mind you, i do not stretch before i play, but i do "play" before i play. Sit down, get in tune with my instrument, noodle some. "warm it up", Play with the bow.
Also i want all of you to realize there is a difference between stretching, doing exercises that facilitate Physical Training/Rehabilitation (PT), and exercises that actually are used to Increase Flexibility.
If it makes you comfortable to stretch, do so just please monitor what you do closely as some of the latest stuff suggests it can be dangerous.
In my other hobby, which is quite physical (I also do weight training and cardio every day, which actually turns into most of the stuff i do for my hobby) I dont stretch. I do warmups by starting slowly, but as with cardio, your warmup is usually the first 5 minutes of the cardio
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TL: DR:
Stretching can possibly cause you to be weaker before you play (Studies still being developed)
"Warming Up" Can boost your performance. (Like we didnt know that)
I don't Stretch, i do Warm up.
When i did martial arts as a teen i did use stretches as per the whole class did. In the current physical stuff i do, i dont.