Body balance is an area that is particularly challenging for me. Not keeping my balance but, rather, vertical and horizontal equilibrium—in relation to techniques. My problem is not my technique; rather, it is my body. In particular, from the accumulation of injuries (from karate and real altercations in the security industry) over the years and, of course, imbalances between strength and flexibility: between the left and right `hemispheres’ of the body. As many of you know, when I was very young, I suffered a very serious spinal injury, which I’ve had to work around for over 25 years.
THE PROBLEM OF BODILY IMBALANCES: The problem with such imbalances is that often `we don’t want to recognise them’ in favour of our `better sides’. For example, “more flexibility with one leg that allows for `superiority with particular techniques’ with that leg”; likewise, “…significantly more power on one side that leads to an internalised bias”.In this regard, I primarily recommend utilising the five Heian kata for study. Then Tekki Shodan. There is so much to be gained from the shitei-gata, actually too much. Worldwide I believe that if everyone properly understood (performed) the Heian kata—on a truly deep level—very few would perform kata beyond the sentei-gata (Bassai Dai, Kanku Dai, Enpi and Jion). If we are honest, the advanced nature of the `big four’ “…are well beyond most people in the world who are doing the more advanced kata”. You may now be thinking “How can a guy who does so many `additional kata’ say this?” Well, additional kata are simply for specialisation, i.e. – more options in a martial arts/applicative context… For instructors, this is an advantage to best assist students (as one can coach people in accordance to their specific needs).
Secondarily, I recommend kihon ippon kumite for balance. Not just for techniques but the internalisation of movements and principles. This is deep stuff if fully understood…
Conclusion: Returning to the foundation of karate-do—KIHON—we have a complete system, which perfectly connects kata, kumite and real world self-defence. Nonetheless, body balance must be consciously addressed and this requires a significant level of physical (and mental) discipline. I’d like to wrap up by saying that this is extremely worth pondering and testing in one’s training. Besides being good for every karate practitioners techniques (to optimise effectiveness), it is also essential to heighten one’s musculoskeletal health and physical longevity. 
Osu, André Bertel.
© André Bertel. Aso-shi, Kumamoto, Japan (2014).