If Youtube videos do not play reload the page, that's a Youtube bug.
Or maybe now, a few years later, it's a new bug ;-)

Elephant Gym (大象體操) - Head & Body (頭,身體)

Elephant Gym (大象體操) - Midway (中途)

Elephant Gym (大象體操) - Moonset (月落)

Elephant Gym (大象體操) - Underwater (水底)

Elephant Gym (大象體操) - Half (半個)