Re: peoples’ posture and gait ?
good posture is important as it stops other problems. core strength is important to be able to have proper posture and maintain it, which is what yoga will do.
there was a doctor on bbc radio 4 a while ago who specialises in back problems giving people advice. he was describing an exercise that people can do while sitting that strengthens the core muscles that support the spine. but you do end up spending quite a long time in total per day if you do as much as he recommended.
there are also some shoes that becoming quite popular. they have been around for a few years, called MBT’s. They force you to work with correct posture and strengthen the core muscles.