Here's the thing about the core; it is what is used to protect your spine during exercises and also to give you the most balance to your upper body. In essence, every single compound exercise you do, will challenge and fatigue the core if done right. Squats, deadlifts, benchpress, pullups, chinups, and any exercise you use dumbbells or cables and your arms move independent of one another.
Engage your core during an exercise is like wearing a natural corset for your spine. The transverse abdominis, when tighten and engaged, squeezes the ever living hell out of your spine to keep it supported and "straight". Imagine having a water balloon in your hand and squeezing it hard, but not hard enough to explode. Most likely, as you squeeze, the balloon will stretch out and pop out from either side of your hands. This is what happens to your spine. If you don't tighten and engage your core during an exercise that requires weight on your back, like doing squats, think about what would happen if you put 500 pounds on your back and tried to squat. If your core is too weak, or not even tightened up, before you could even bend your knees, your spine would collapse and everyone would call you Mr. Slinky.
My favorite exercise to show how the core has to be used for balance is doing a Dumbbell Bench Press, but on a stability ball (or swiss ball as some people call them). It's the same setup as doing it on a bench, but your shoulders rest on the top of the ball, and you have to lift your hips up off the ball so they are level with the rest of your body.
http://www.afitsecondhalf.com/wp-con...m_M_Finish.jpg
You have to challenge your core the entire time by 1. keeping your core tight so your hips stay up, and 2. as you move the dumbbells up and down, there will be tiny motions that will throw off your balance and to counteract that, you have to fire off the small stabilizer muscles like the obliques and rectus abdominis to keep your balance.
Running shoes have so much cushion on the bottom to help protect your feet, that it acts like a tiny bubble of air you stand on while doing squats and deadlifts. when you start moving, you have to push through that cushion of air before you can move the bar. It's dangerous/unsafe/stupid because your balance is completely fucked.
I freaking love my vibrams too. Had my first pair of the KSO for a good two, coming up to three, years and they're still in great shape. I just bought my 5th pair (another pair of Komodos) last week with part of my tax return.
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