Squat - explosive

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

Squat :

Place the bar as high on your neck as comfortable. Grip the bar with your hands as close to the shoulders as comfortable, and ensure that your elbows are pointing directly downwards to the ground. Use a foot stance that is shoulder width, and have your feet either straight or slightly externally rotated. Immediately prior to commencing the descent, bend your knees slightly, suck in the lower abdomen, and squeeze your cheeks. This will ‘set’ your pelvis in a slightly posteriorly rotated position. As you lower, keep the hips in line with the spine - which means maintain this hip position. Don’t misinterpret this - you can flex forward at the hips, just don’t change the hip/spine relationship. Squat as deeply as you can without exceeding forty-five degree trunk flexion relative to vertical. Keep your knees equal distance apart during the lift. Immediately prior to the ascent, focus on squeezing the cheeks tight and hold them tight during the concentric phase. The aim here is to prevent anterior rotation of the pelvis during the initial phase of the ascent. The concentric phase should mirror the eccentric phase exactly

Explosive Squat :

Perform the technique as above but aim to perform these reps with maximal acceleration in the concentric phase, ideally allowing you to finish on your toes. This exercise is more about trying to lift fast than actually looking fast.

Explosive Squat :

As above, but try to move the weight as fast as possible during the lifting phase. Accelerate as fast as possible such that you finish on your toes.

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):

Explosive Squat :

Begin by standing with feet shoulder width apart, bar resting on your upper traps. Grip the bar with your hands as close to the shoulders as comfortable, and ensure that your elbows are pointing directly downwards to the ground. Keep your feet either straight or slightly externally rotated. Squat as deeply as you can without exceeding forty-five degree trunk flexion relative to vertical. Keep your knees equal distance apart during the lift. At the bottom of the squat, pause briefly and then explode up – as fast as possible, so that momentum carries you up onto your toes, almost coming off the floor. The main difference between this technique and the regular squat Is the rapid acceleration in the concentric phase – we really must strive for speed at this point.

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 two 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....