We use "baseline" workouts which we revisit at various times in the year for various reasons. We block periodize (structured to emphasise different factors at different times of year) to a large extent so we may use our "endurance" focused test during a strength block to see if guys have dropped off in that area significantly (they almost never do), we may use it during its sister phase in order to see how far we have progressed etc. End of the day, this is a bit of science, but also a bit of art. We like having some broad metrics to use as in-house comparisons though, even if it is just for our own "gee whiz" amusement. I think they are helpful.