That was my thoughts Mysterious, I was only covering a Yoga class as a one off because the their regular teacher was away. I did qigong/taichi and at the end they all suggested that they enjoyed it more than yoga. (Hoping to get a new regular class going with them)
The one that visualised roots growing has been attending my other classes (martial arts) and I know she consistently visualises the roots. She is also quite a spiritual person and the wood element does influence that in TCM terms.
It would be interesting to see (if I can recruit the others into regular training) as to whether pairing them with constructive and destructive elemental partners effects their flow/sensations?
Like wood with the fire person will the fire person benefit more? etc.
Anyone else want to try and experiment this way?