If someone asked you to walk heel to toe along a straight line without holding on to anything, could you do it. What if they told you to balance with your feet together and eyes closed? Do you feel comfortable going up and down curbs or inclines/declines? If you answered no to any of these then you may have some concerns about your balance.
Balance and fall risk go hand in hand. Those of us who struggle with balance and proprioception (the ability to sense where your body is in space) are at an increased risk of falling and therefore injury. It doesn't matter if you land on your knees, your hip, or an outstretched arm, chances are you're not coming out of it unscathed.
Physical therapy focuses on retraining the body to be aware of its center of mass and it's orientation in space. By providing an individual with a balance task and then adding a simple challenge (such as closing your eyes, singing, or playing catch), we can help improve the ability to maintain balance and reduce the risk of falling. Now here's the good and the bad about it...it's just like riding a bike, but if you don't use it, you can lose it.