Watch out for crunches, even on the ball. They compress the spine and the discs in particular. Twisting crunches (i.e, oblique crunches or bicycle crunches) are even worse as they flex and twist the spine. This actually "corkscrews" the spine so the discs are really squashed.
Sport movement, is actually NOT twist based. Sometimes it really appears tha ways, but even golf swings or skate skiing, the power COMEs from the center, but the movement is actually a shift in weight from the center from one leg to the other. Its actually not a twist at all.
Many trainers spend too much time teaching the spine to rotate when they should actually be teaching it NOT to rotate. (ie get the core to brace properly).
I can go on and on and on (as you can most certainly tell!) but i am pretty passionate about this issue. from my own personal experience, I do 20 minutes of my own core work out, i did a 24 hour solo race last year, and didn't experience one minute of back pain during my ten laps.
smile!
Hannah



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) but i am pretty passionate about this issue. from my own personal experience, I do 20 minutes of my own core work out, i did a 24 hour solo race last year, and didn't experience one minute of back pain during my ten laps. 