Here is a small drill in concentration or putting yourself here and now: Do a static push up counting your breaths up to 120 or 300 without loosing count or messing up your breath. Do the same drill for other movements (yes staying in one place is movement of tension and breath and so on) and see how you fare.
Another drill of such nature is to finish a defense from attack with the same breath you started with. This will help a lot in simplifying things and avoiding unnecessary movement.
The Martial Art of Walking 