The only downside comes if you have no experience working with kids or if you have the idea that kids are innocent and nice. You have to remember that you are an authority figure and not the children's friend. That does not mean you have to be difficult. But when a child acts out, you have to consistently discipline them and be firm or else they will not take you seriously. I have seen a lot of workers leave because they weren't able to handle the stress of the environment. Some of these kids have other issues in their lives, so you the YMCA sets up regular orientation and training programs to help you deal with the children. The downsides aren't caused by the YMCA itself, but the nature of the work.