Can I expect the same level of improvement in strength & speed each year that I utilize a strength & conditioning program?
It is not likely that an individual would make the same increases in strength and speed 3-4 years after starting a strength & conditioning program. Every individual has a genetic ceiling to reach and the longer one trains, the closer one gets to that upper limit. When starting a program, the largest gains in strength & speed will most likely be made during the first year. However, professional/elite level athletes continue to train just as hard if not harder than when first starting out, since making just minimal gains in strength & speed often means the difference between winning & losing individual battles in a game. Being faster by just a tenth of a second in a 10 yard sprint could make the difference in making a successful play.