Oily Dragon
Senior Master
Speaking of Xing Yi. Around 6:20 he mentions using the elements with his Yi. Hahe you heard of this skill? I can't say I've quit heard of it in how he seems to apply it. For me the training was more mind set based
That arm conditioning exercise is called Da Saam Sing, 3 stars hitting. It's a legit conditioning exercise, actually found in other old Asian arts like Muay Boran, very similar to what MT fighters do to condition their legs.
Yi just means intent. It sounds like he's talking about how he intentionally relaxes etc, which is an important part of the Stars training..you're not trying to smash arms but to use gravity to let the stars on each arm connect with your partner.
Very important to train this properly using liniments, slowly over time. This is a type of Iron Shirt training that definitely creates very strong forearms.