Originally posted by JeetKuneDo:
One of the thins that Sifu Bruce Lee stressed was that you should "Curl into your sit ups rather then having a straight back, and lower your body VERY slowely, he used to do sets of 20 sit ups, and he would do them soooo slowly that 100 reps was impossible, he also stressed that working a sit up over 30 degrees took the work off the stomach and onto the thighs. ....
*** Bruce lee was correct when he sated that over 30 degrees trunk flexion is when the rectus femoris and ilosoas come into play.
The swiss ball puts your abs through a full ROM compared to the normal floor crunches you see most people do.
The abs function through 40 degrees extension and 30 degrees trunk flexion.
Doing them on the floor is like only doing half a bicep curl.
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