Recently I tried a Crossfit and Heavy Bag class that pushed my limits physically. After completing the classes, I felt accomplished and realized how the process applies to our lives:
Ready. Prepare your mind. When facing something uncomfortable or unknown, the easiest decision is to back out (trust me, I've done it many times). Your thoughts trigger your feelings and how you feel determines what action(s) you take. Being self-disciplined is key. What you choose to focus on usually comes to fruition.
Set. Put it in your calendar and be accountable to someone. Those who fail to plan, plan to fail. Don't let your feelings dictate your behavior. Mark Cuban, argues "Don't follow your passion, follow your effort." 90% of success is follow through. Will your way through it even if you don't want to. You'll be glad you did after.
Grow. The hardest part is the start. For example, if you've ever tried a spinning class, the most difficult stage is the first 15 minutes. After that it gets easier. Growth is a painful process and most people would rather avoid the discomfort than push themselves. Don't live with regret. Try and break through your personal barriers.
Doing the same thing over and expecting different results is insanity. Successful people don't fear failure, they know it's part of growing. Give yourself the best chance to overcome by setting goals, having an accountability partner and willing your way to victory. When's the last time you pushed your limits?