The ability to sell out- to go until nothing is left in the tank is one factor that separates the good from the great. There is no better feeling- empty totally wasted, but full of satisfaction and a sense of accomplishment of leaving nothing on the track or in the pool, but total effort. Can you achieve this? That is the challenge. You must be willing and able to do this to step toward greatness. This willingness to push the envelope only allows you the chance to be great. No guarantees, no entitlement, merely a foot in the door, a step up ladder of success. Go for it- lay it on the line- begin the journey- take the risk. Nothing ventured, nothing gained.