A single prop that does not look real to an audience can louse you up. The same is true of the smallest flaw in setting up the motivation in a story line.
I'd say the most memorable thing for me was my dedication and motivation in how I got so involved in boxing.
Desire is the key to motivation, but it's determination and commitment to an unrelenting pursuit of your goal - a commitment to excellence - that will enable you to attain the success you seek.