I was released from the Army last Sept, and plenty of NCO’s would tell me that your core is such a large muscle group, you can literally work them out every day.
Now, I don’t know if this is just their ignorance speaking or what, but wouldn’t that be an overload on the core? Maybe they were speaking strictly using body weight??[/quote]
You CAN,but it’s not necessary in order to have a strong core,and if you were to train it every day,in my opinion,you would certainly be doing more harm than good if you don’t mix it up as much as possible-isometric (i.e. plank) twisting,targetting lower or upper abs or obliques as appropriate on different days,with different exercises,etc. instead of a total beasting every day.
doing say,sit-ups and crunches every day would seem a bad idea unless it was very specific,i.e. boxing/martial arts or correcting a severely lordotic spine.