There is nothing like having to change your physical form to put you in contact with every weak part of yourself, to train yourself in discipline. Put somebody on a treadmill and I’ll tell you how good they are at any other thing they do in life.
Don’t ever let someone tell you that you can’t do something. You got a dream, you gotta protect it. When people can’t do something themselves, they are going to tell you that you can’t do it.
