Sorry to double post - wanted to comment on this.
There are a lot of theories and advocates of what's bee called "functional strength training". The two 'biggies' in the area are Juan Carlos Santana and Paul Chek.
I take issue with the tern "functional strength training". It's grown into this huge umbrella, and the training has gotten so that it's functionality should be questioned.
To answer your question, yes you'd activate more muscles to control the uneven balance. But my question is "is it functional?"
One of the 'laws' in strength adaptaions is called specificity of training. Basically it states that strength gains are specific to the training method. If you sprint, you'll build up anaerobic capacity. If you do intervals, you'll increase lactic acid threshold. If you bench press, you'll increase bench press and chest strength. However, going back a few posts, that bench press strength doesn't mean you'll be able to block defensive linemen. Yes, it will help a small bit because of general strength gains, but a better method of training for that sport position would be to perform bilateral chest strength training in a standing position. You wont be able to handle as much weight, but it's fore functional because you're in the same body posture as the sport. On bench press, you're back is stabilized against a rigid surface, your legs are not supporting your body weight, your abs are not working to stabilze your upper body against the resistance, and the weight is evenly distributed between both hands over a rigid bar. Instead we stand you up and have you assume a sport position (bent knees and waist), then but an independently controlled resistance (rubber bands, cable-crossover style machines) then have you press both arms together or alternately. We also have you do things like deep squat with a heavy med-ball (10 or 15kg) and explode up and out, throwing the med-ball up and out for distance. These exercise are more sport functional then a bench press. The bench press, then, is just another tool in the bag-o-trix. We just use it for strength testing because it's an easily measured exercise.
Santana and Check go to other extremes, even for non-athletes. Check likes to train people how to do squats standing on a 55cm Swiss ball (the big gym balls people do sit-ups on). He claims this is more functional because it makes the abs work tripletime, and because your body has to work so hard to balance. More muscle activity = more functionality. However, if we keep in mind the basic law of specificity, that training will only be utilized when performing on a dynamically uneven surface.
Said another way, the only reason your abs are working so hard is because you're standing on an uneven surface. Take away the uneve surface and the abs stop working. Most activities are performed on the earth, so your feet are stable. Your abs may have been strengthened, but they're not being used, so wher's the benefit? Santana does similar multi-movement exercises, like push up and in the up position lift one arm sideways and rotate your body so that arm points straight up and you're looking sideways. Return to push up position, do a push up, then rotate on opposite arm.
Being the police is like beinng an athlete, with the running, sprinting, fench jumping, and wrestling. So that;s how I like to train it.



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