Gymnasts typically have strong cores because every single event requires strong abs. Rings especially. The reason gymnasts generally don’t squat or dead is because those build muscle in the places they dont need, namely the legs, which are dead weight in all events but floor and vault.
As for those who say ONLY squats and deadlifts produce ab strength, WRONG WRONG WRONG. The central theory of exercise is that the body adapts to the work it is subjected to. In squats and deads, the abs act mainly as support for the other major muscle groups acting. They will get stronger as more support is needed for heavier squats and deads. You’ll gain ab strength, but that’s not the only way to do it, hence the point of gymnasts and fighters.
In short, squats and deads make your abs strong enough to support the weight you’re putting up. If you can’t support the weight, do ab work so you gain that stability. [/quote]
The point was, as far as weightlifting goes, your abs get only so strong by targetting them and you need squats, deads, and stuff like the olympic lifts for them to continue to gain strength. This is basically the theory a lot of people believe in.