There are a lot of misunderstandings about the centre and using it. Often times people thing that a Chinese translation is a metaphor when in fact it is a direct instruction, an example is sticking your belly out. A lot of Aikido players explain away their large ale gut by saying that it is their tan den /' dantien.
If you stick your belly out while doing sanchin and have somebody push their hands at it , you can push them back with little effort when you move.
This is a good example of what I meanhttps://www.youtube.com/watch?v=u9iqsfIbwLQ
you can also find it inclassical Japanese sword fighting