I've never paid for a push-up or a sit-up in my life - And I've done millions.
Vision is purpose, and when your purpose is clear so are your life choices. Vision creates faith and faith creates willpower. With faith there is no anxiety, no doubt-just absolute confidence.
Self-confidence is something caught and not taught. And, risk-running and chance-taking are the only ways to catch it.
The mind is the limit. As long as the mind can envision the fact that you can do something, you can do it.