Achieving six pack abs is quite an accomplishment. It's the crown achievement in training because of the inordinate degree of leanness required.
The key to ripped abs is an extremely low body fat level. A lot of guys can do the ab work necessary to develop a high level of muscle size, but the dietary restriction required to make the muscles visible is often beyond the discipline level of most people.
Gymnastic moves are a great way to develop washboard abs. If you're not a gymnast, you can do body weight exercises like pull ups, push ups, inverted rows, and dips. They will build your upper body and abs.
Another benefit of having a Six Pack: Women LOVE IT!!
Women can have a Six Pack too!! They are somewhat controversial though. Some see them as being too masculine, others love it.
Far too many guys have a keg rather than a six pack :-)
This is what a "Before" picture looks like