No shortcut to improve your running
There is no short cut that will help to achieve new PB, the only way is to run more. Other ways will help but marginally only. There are a thousand and one way to improve but it's how you tailor it to suit yourself. Some like to run in the morning, others like to run evening. Some people like to listen to music when they run, some have to dress like a pro, etc. One very important thing is to know yourself, do not overdo any one thing and get hurt or injure you body. And of course having a positive attitude will definitely help as well.
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