I work in the gym; twice a week, I do abdominals. It is very, very important. I do quick sessions, as I don't want to get big.
I did about 50 pull-ups and 1,000 crunches a day. Crazy.
I think planks and crunches are an old-school simple move, but it's the way to go.
I have a series of exercises in which I do a lot of core. I enjoy an ab workout. I practice every day and do many different types.
There's no doubt that 'the plank' is one of the best core exercises on the planet.
Crunches only go so deep.
I like that I've been able to maintain a good stomach and chest. Push-ups and sit-ups are my go-to. It is the simplest routine and the best thing to maintain my stomach and chest. I'll do about 100 of each a day, usually when I'm already warmed up.
I've always done ab work, even when I was pregnant.
It's important to train your abs front to back, side to side, and all around to look great all around.