The last few years have seen athletic development really take off.
Coaches of strength and conditioning are learning about their athlete's and how to improve their athleticism, in ways that really advance on old ideas.
Here is a great example: read about Shannon Turley and how he turned Stanford's conditioning program around for the football team.
I am confident there were other factors that improve Stanford's win total, but I am also confident that Turley's approaches were significant.
Keeping players injury free is being recognised as critical for athletic coaches. It is most important way they can help their athletes.
Lastly, it is great to see the arrival of better assessment tools, so athleticism (and not just power or speed) can be measured. Here is the Function Movement Screen which Turley uses.