I've heard all of these rumors that diva cups stretch you out, but I think that's a myth..
I do believe this rumor is false. The DivaCup conforms to you, not the other way around.
In have no proof of this, but it’d make sense if it actually helped to exercise your vaginal muscles. Considering that it is actively holding the cup in and DivaCup recommends doing some kegels to get it in the right spot.