You can also see which groups each individual has access to, or is in, via the License Audit Module
The License Audit Module was designed to show what License/s each User has. It also provides a list of the groups each User is in.
Open the csv and see the list of Groups as Coach and Groups as Athletes
All of the Users' Groups will be displayed.
You can see here that these Users are in the Import Group and the Archive Test Group as Athletes. They are not the Coach of any Group/.