Thank you so much ! is there a source to get further info ?

Thank you . "the (mental) tension stored in your physical body" could you please explain this bit more ?

Thank you. I'm practicing the meditation dhammatalks.org/mp3_guidedMed_index.html. "If what you are doing is a simple task you can largely be aware of your breath while you do the action in the background. If you are doing a complicated task then you'll have to put a lot of attention on the task but keep an awareness of the breath in the background which you can frequently go back to momentarily to remind you of equanimity, in that way the breath is like a refuge." this is what I exactly need. Where I can find instructions ?