Dub over on the exrx forums posted a link to this site in a thread there:
The Personal Trainer Development Center
It's got a lot of good, easy-to-read articles on personal training from the perspective of a trainer. It's worth digging around in if you do this for a living, or if you train under a personal trainer.
声を出すことで盛り上がる…（火）グラップリング小川クラス20:15〜
17 hours ago
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