My go-to source when it comes to Mindfulness Meditation:
http://amzn.to/2zdvCZe
If you are a complete beginner to meditation or you think that you are meditating wrong then check out this video:
"Your back is hurting. Are you meditating too long?"
Here's the answer:
00:24: Gradually increase the time
01:03: Do what fits you
(Most likely, you will start with 3 minutes)
01:34: Set a timer
"It's not a competition!"
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