Vertical jump.

Stand next to a wall. Rise your arm, fingers pointed as high as you can. Mark that spot, it is your baseline. Jump vertically as high as possible and hit the wall with your fingers. Calculate your score (cm/inch) between your baseline and highest point. That is your score.

Repeat the test 1-2 times a week to follow your CNS recovery. If you see variables more than 10% it is time to back off from training and rest and recover.