For all of us there are challenges that we should take on to make us test our limits. For some it maybe learning to overcome a fear that holds them back. For others it maybe overcoming a handicap. For me it has been running and seeing how far I could push myself to determine where my limits were. Even though I didn't reach most of my running goals I gained some knowledge about how disciplined I could be in reaching a goal. This has translated into other areas of my life beyond running. I can be very persistent and tenacious in reaching a goal I set for myself. What we accomplish is limited mostly by the narrowness of our goals and our fear of failure. We give up too easily. As the saying goes "the race is not given to the swift nor the strong but he who endures until the end."
So what limit do you want to push? What fear do you want to overcome?