What exercises are good for bow-legged?

I completely agree with my colleague. There could be many medical conditions that are leading to their condition, many of which are structural in nature and no exercise will be able to change that. You need a good medical history and maybe even talk with their physician to determine if this is something that needs to be corrected or best left alone. Just because they don’t fall in line with what we would consider proper alignment doesn’t mean that should be forced to achieve it. Knowing when it’s incorrect to correct is a huge part of the equation.