I completed my first century 2 weeks ago. I felt good, my legs werent that tired, but when I finished I instantly knew what I had to work on...my core strength. About 50 miles in, my posture on the bike started to slump and I felt generally weak in the mid section. I am admittedly overweight and my legs are about the only "in shape" thing on my body. Ok, enough background, here is the question:
I am looking for a good half hour workout I can do every morning that can really strengthen my core muscles. There are thousands of dvds, books and workouts out there, but I am lost as to which one is for me. Has anyone been in this similar position and found somehting that worked? Is there a routine you do that has given you a rock solid core? Videos? Books? Any help is much appreciated.