I agree that it is not necessary for a coach to be "male" to effectively spot bars/vault, etc. However, it is imperative as the gymnasts train optional levels that they TRUST the coach to protect them. I have overheard more than one carpool discussion about a male coach whom the girls did not trust, and the new male coach whom they totally trust. No doubt that appropriate (not heavy) spotting makes a huge difference in learning bar skills, from cast/handstands to bar changes. In general, I think there are more men who are comfortable with the level and frequency of physical effort required to "spot" bar training, but that is not to say that a female coach "can't" do it. I think as a gym owner, it would be harder to find a female coach interested in training optional level bars and competent at doing so. Of course, just being male doesn't make a coach a "better" bars coach either.