Congrats on your race!

I am just doing it so I can feel confident in a bikini....j/k, well, sort of.
I do my core work everyday. Some days more, some days less. There are definitely changes in the way I look and the way I feel on my bike and in my swim. I "feel" myself engaging my core in all my activities.
We don't have a list going per se, but occassionally people will write up the exercises they did that day, and I have picked up a few new ones here and there.
I usually do my core work after the kids have gone to bed and I am hanging out watching tv. I just get down on the floor and get 'em done.

i'm not as hard core as some (so to speak)
i'm just doing 3 days of core w/ pushups on the days in between (5 days total), 20 minutes max for any day. i just do my thing before my morning shower.
but it has been beneficial and i can feel the difference in my posture both when working out and not.
obviously, the rate of improvement is not as fast as if i did 5 or 6 days of core a week

in my brief survey, one out of one wives surveyed enjoyed the results :p

I have never felt better or have been able to really see my abs before doing this. My aero position on the bike is easily held. My shoulders feel discomfort before my back. If you would have told me that was possible a year ago I would have said bullsh%$. It also feels pretty cool when swimming to actually notice your abs flexing with each stroke. I also was amazed at how easily it became a habit. Knocking out 500 reps a night is not a problem. 1000 requires some effort and in the offseason I was mixing 2000 rep days each week. I never really had an issue with being over sore.

Plus we may get to see a picture of jtrimom and Warrior in a bikini one of these days ;-)

I did core work sporadically for years and never really saw any improvement. Joining the challenge held me to a new standard and after doing core work every day (most of the time only 1 or 2 pts = 100 - 200 reps), I saw amazing differences (I did Core Challenge 1,2 & 3 and now this most recent one). My back doesn't feel as tired or get sore when I go long on the run or the bike. My swim feels more powerful.

And I am 40 yrs old with four kids and I can rock a bikini. Yeah, it was worth it ; )

PS. I do a huge variety of reps b/c I get bored easily. Personally, I have found the windshield wipers (on your back, arms out for balance, legs together at 90 degrees rotating from the left to right and all the way back) and the planks (60 secs at a time, left, right, center) to have the greatest impact.

I'm not trying to answer your "How many days a week?" question, as much as ask what I'm missing. Obviously a lot of people doing the core challenge do not think like me.

I'm amazed at how many people do core work every day. Some people claim that abs, calves, and forearms can be worked every day, but I'm seeing most of the information out there says to give abs the same rest that you would any other muscle. I did a Google search on "ab workout frequency" to confirm what I have heard all my life. I'd say that doing core work 60 min every other day, rather than 30 per day, is the most benefit per time spent.

My workout log will show you that I spend about 30 minutes per month on core, so I guess doing 30 minutes per day would help a lot.

ya, I am doing b/t 10-20 min a night of core- that easily gets me 5-7 points depending on what kind of torture I choose to inflict on myself ;)

settle down now, I don't have any frequent flier miles, and the people on this site will hold you to it

Correct me, but I think the abs/core are special in that if they are good everything around them works, if they are not, then no matter how good what's around it, (legs arms, upper torso, ) wont be nearly as effective as with a good core.

Yes I agree with the One day off and one day on, but I still do it every day, it's a discipline, and it's helping me recover a lot. I would imagine it's also an area, that is worked, through many forms of excercise without people realising it, for me, this is just bringing attention and focus to it.

Besides, I do actually find it addictive, as the man said, a day without core is like a day without sunshine. :-) I don't have either around here ;-)