All 3 videos were posted by Dmitry Trubin on vk, scroll down to watch them all:
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Тренинг кисти (Google translate: Training brush)
Изометрический тренинг (Google translate: Isometric training)
Бицепс,лучевая,добивание… (Google translate: Biceps, radiation, finishing moves …)
Source: Dmitry Trubin
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