The definition of balance is keeping your center of mass(COM) over your base of support(BOS). If your center of mass goes outside the base of support, you fall. Manipulating the COM/BOS is how therapists move people. Ok, so in standing, a woman’s center of mass is like around her belly button and a dude’s is around his chest. When you’re standing, your feet are your base so stand up and draw a circle around your feet – that’s your base of support. Stand with your feet wider apart, it’s easier to balance right? That’s because you just made your base of support bigger. When balancing on one leg you have a wee little base of support so it’s harder. That’s why therapists tell people to use canes and walkers, to increase their base of support. When you’re using a cane, your BOS is no longer just your feet but the point of that cane is included in the circle around your feet so the BOS is bigger.
But sometimes the muscles don’t cooperate or aren’t strong enough and it doesn’t matter how freakin’ big you make your BOS. So, yeah.