CK's version of the core strength test is horrendous. I'd love to know how many people can do it their way. For me, with terrible hand and foot problems, it is simply impossible no matter how great my core strength is. I spoke to someone about testing core strength and he told me to do the test from my elbows. That works much better for me but I still can't put that much pressure on my toes long enough to complete the test. From my knees and elbows I can do the entire test and hold the basic position 'til the cows come home but I have no idea what this says about my core strength.