gaming is the same as any other occupation.. you will always get injuries relating on your occupation (be it sport or office or labour related) unless you live like a healthy person where you exercise / stretch often etc which isn't a given anymore.
I'm hoping it's just that this whole competitive gaming thing is still in the early stages so the things people are doing aren't very 'forward-thinking' yet... when I read interviews about how they 'train' like 16 hours a day or whatever, that's unhealthy for any activity you are doing. Hopefully people will realise and start coming up with normal 'training' routines.
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