I'm a 18 year old guy that has been practicing chi, and i'm just still in the beggining, the key to success isn't only meditation, but way more stuff, all you have to do is believe, and i guarantee that you could do way metaphysical stuff when you get dedicated, but that's not the point in IM, because there is no way you can do it, i practiced 17 hours a day for this summer, this is no easy thing to do, and if you do stuff wrong, you could finish in a dead end way, so please don't ruin your life with this lack of knowledge, and avoid using sources such as youtube, because some meditations can unlock without your permission your third eye chakra, and if you're not ready for it, you could just go crazy and see other dimension stuff, PLEASE don't do everything you hear or see, this is serious stuff, and isn't for anyone.