I've always felt like the most improvement you can make is from year 1 to year 2, much like a college freshman who the most improvement he can make in an entire one year of college football is going from year 1 freshman year to his sophomore year. Like a pro football player going from his rookie season to his second season. There's a window there that will never come again that you have a chance to making your biggest strides.
Jim Harbaugh