關於愛，我是個小學生。

here is so useful a pater to reveal the interaction between the gluteus medius et maximus and peak pelvis rotation from ijspt:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3362989/

where i learned that

1. increainsing and coordinated pelvis rotation speed and gluteus strength are closely linked, and

2. the value of club head peak speed may be the sum of those of pelvis, torso, and arms, which is 2250 = 500 + 750 + 1000 (degrees per second).