i think you have to properly learn how to hit the bag,if your arms get tired you are not hitting it right,are you swinging like someone who is trying to swat a fly,are your hands open and are you slugging like you are trying to tear the bag apart,if you continue to hit the bag with fierce uncoordinated,wild,swings you may dislocate your shoulder which will put you in a sling for a couple of weeks,so take your time and start from the basics,stand in front of a mirror and throw punches slowly at first jab,jab,right

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