Hurdle Jumps

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

Hurdle Jumps :

Stand facing a group of benches, hurdles or small boxes. Jump up and OVER the obstacles. Minimize ground contact time. Try to move as fast as possible over the obstacles.

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):

Hurdle Jumps :

Stand facing a group of benches, hurdles or small boxes. Jump up and OVER the obstacles. Minimize ground contact time. Try to move as fast as possible over the obstacles.

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

And I came upon this description another four more times by the same 'author' in different publications.

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....