the yi jin jing that I learned has 43 distinct "exercises", many of which I have never seen done in any other school of qigong, and has numerous postures that are very similar to yogic asanas, including a few floor-work ones; as to their origin, I couldn't say, although my sifu likes to point out that in Cantonese, "yi jin" is pronounced "yik gan", which sounds not entirely unlike "yo ga"...