Just read a great article

http://ymaa.com/articles/generating-jin

Nei Kung can also be called Nei Jing.

not surprisingly the author is someone I already recommended
a book on. Please check out the link.

Ideas presented:

Yang Jin (aka Li-Qi) muscle strength
Ying Jin is relaxed muscles

The meditative mind increases the power of these

Brain wave monitoring

I have been meaning to buy this product.
Should be good to help reduce the heartbeat
which is another way of slowing down brain waves.
The product can help with meditiation.
http://www.neurosky.com/Products/MindWave.aspx