Well, depending on who you ask you would get different anwsers. But I personally think that depending on your physical condition you would want to choose between sit ups and crunches. If you don’t have a strong back and/or you have some kind of problem with your back, stay with crunches, they are EASIER on the back and still work enough in the long run. But, Sit ups are good for only rare occasions. I mean, crunches are much, much more easilily used. All in all I would personally stay with crunches. But here is some counter info for you people. http://www.abmat.co.uk/situp.htm . Sit ups, crunches, they both have their pluses depending on the person using them, but a large percentage of TKD and WSD MA practioners will tell you no to sit ups.
-Beldmort
Tricking Haze 