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What do you note that is different about the two diagrams? The top panel shows medial loading to promote internal rotation, the external rotators needing to work harder to maintain correct alignment. The bottom panel shows lateral loading to promote external rotation, the internal rotators needing to work harder to maintain alignment.

This is one of the many loading patterns you can use with wearable resistance to promote movement variability. Remember the velcro weights can attach anywhere on the garments i.e. proximal, distal, anterior, posterior, medial and lateral. So the same movement with different loading patterns, can result in subtle changes in muscular recruitment and provide tissue movement variability that may make the athletes more injury resistant.

This concept was shared with me by Chris McLeod Lead S&C at UK Lawn Tennis, he also thought that such loading could provide athletes neuromuscular flexibility to adapt to different situations. Skylar Richards mentioned previously that this type of loading may vary the point of force application, providing a different anatomical overload and therefore limiting overuse injuries. We haven’t quite got the research yet, but intuitively it makes a lot of sense