Depth Jumps

In 2000 (and on a few other occasions) I published and claimed copyright on this exercise description (bolding added now):

Depth Jumps:

From a standing position on top of a raised platform, extend the dominant side foot forward and then drop off the platform (as opposed to jumping off). Hit the ground with both feet simultaneously, with both arms extended behind the torso slightly. Upon immediate contact with the ground, reverse direction and propel upward, assisting with an arm swing. Try to minimize ground contact time.

I was conducting research and I came upon the following exercise in a publication copyright claimed by another 'author' at a subsequent date (bolding added):

Depth Jumps:

From a standing position on top of a raised platform, extend the dominant side foot forward and then drop off the platform (as opposed to jumping off). Hit the ground with both feet simultaneously, with both arms extended behind the torso slightly. Upon immediate contact with the ground, reverse direction and propel upward, assisting with an arm swing. Try to minimize ground contact time.

And I said to myself: “That looks familiar!” So I cross-referenced it and I said to myself: “Wow! No wonder that looked familiar!”

I noted that the use of this description was in the absence of credits or references to the origin or permission to use from the original author (myself), and that the 'author' claimed copyright....