For starters, never try to take a running start. Don't apply so much effort. That starts your mind out thinking that you will need to work hard in order to do this, and that leaves room for the doubtful question to pop into your mind, "Am I putting in enough effort?". That's where things to south. The only way that you'll reach the goal that you want, is to keep in mind that effort has nothing to do with goal achieving in dreams. It's all about understanding that you can have anything, if you don't hold on to why it shouldn't be possible. Your whole waking life, you've been a slave to the physics of gravity. In your mind, you're still a slave to gravity. But remind yourself... gravity and force, do not have any meaning in your dream unless you allow it. Good luck! I hope this concept helps in your dream control all around.