Originally Posted by disski
Also situps does not equal CORE STRENGTH..... different muscles used than the deep core muscles you really need....
And what works the "deep" core muscles, and what muscles are those other than the lower back, the abdominals (specifically the obliques, the rectus abdominus and the transverse abdominus) and hip muscles?
(Pardon my ignorance if that's a foolish question and there's widespread agreement on what core strength/core muscles means, but a google search of "core strength" turns up 2.6 million hits, and the quickly skimmed few seem to be discussing mid-body strength prominently involving the abdominals named above, the lower back, and hips.)
In demanding skiing, or at least in the kind of skiing one does in a GS or slalom course, it seems to me that along with hip and gluteal muscle and legs (1) you use the rectus abdominus a lot, both the lower abdominus in leg retraction (my test for that is muscle soreness after doing lateral hops over a high broomstick or sets of stadium hops up a very steep multi-story staircase) and both the upper and lower rectus abdominus in getting forward (or, in my case, ahem, trying to get back forward after getting back), (2) you use the obliques, both in twisting movements and in a side crunch to load up the outside ski (look at angulation in high-level slalom skiers), and (3) you use the muscles of the lower back (erector spinae?) to straighten up again after being thrown forward. Seems to me you'd use all of those in situps with a twist. You use all of these muscles, and more, for stabilization and balance adjustments, but mid-body strength developed through exercises like situps (and sidebends, and good mornings or deadlifts) seems very relevant to core strength.
(Caveat: many people argue that there is no such thing as the "lower" or "upper" rectus abdominus, that it's one muscle used in any contraction forward, when you're trying to put your shoulders closer to your knees. My experience is that, whether that is true or not, it's also definitely true that some exercises (leg raises) create lots of soreness near the lower points of attachment and other exercises (weighted crunches) create lots of soreness near the upper points of attachment, so the abdominus responds to training as if there really are separate ways to train the abdominus for very different things: Pulling the shoulders and head forward or retracting the legs.)
What am I missing?