Do you have to hold your abs tight?

Remember the last time someone playfully pretended to punch you in the stomach? Even though you knew that person doesn’t mean you any harm,  you still instinctively hold your abs tight. Your whole core tightened and you pulled back. Once you realized they were playing, you probably even “playfully” punched them on the shoulder…You didn’t think, you just reacted.

When you saw it coming, you didn’t have to tell your abs “hey, tighten up down there, a punch is coming and there are vital organs t...