If only one exercise is done for athletic timing, speed, endurance and power you might consider the full clean & jerk-press. It is a prime muscle mass builder from the whole chain of back muscles as well as the shoulder girdle. Can also include the squat-clean & jerk-press from time to time. Not only will you become a very thick muscled & powerfull person but you will take on the appearence of a guy who could very likely walk through a wall.
If you want to two part this exercise (split) than do cleans as a single unit and than the jerk-press off of a power rack, squat rack, etc. For an example of the affects of this exercise:Take a basic Olympic bar (135) and try and do 20 reps of the clean and jerk-press, if you can. The next morning (and the following 5 day's) you should become outstandly aware of how well this exercise hit's the shoulders, traps, total back area, hips & legs. For a regular workout might do 5-9 reps of 2-3 sets . From time to time increase the rep range from 12-20. Your stamina (endurance & strength) for sports should improve greatly, if you put max effort into the movement. Good Luck.