A lot of people think “sucking in” is activating their abs. It’s actually quite the opposite. Sucking in deactivates most of the muscles in the trunk and makes your body an hour-glass shape and if you think about it, an hour-glass is not very strong in the middle. What you want to do instead, is make your body a column. Columns are strong and supportive and when you practice the exercise below, you will feel the strength and support of the column/ab shield/bracing (whatever you want to call it) throughout your day as well as your training.
Train Smart. Be Strong. Live Balanced.