I picked up a copy of “Core Performance for Endurance” by Mark Verstegen last week. Again, my curiosity for different exercise programs has driven me to try his core workout. Mark uses half of the book explaining why core strength is important, which I find it to be a bit wordy. But he reassures me that having a strong core muscles will help me compete and live as an efficient individual. His core workout takes about 20 to 30 minutes per day. I break down his exercises into three segments and do them during my break at work. Mark Verstegen has a website for his “Core Performance“, which also gives you plenty of information about core training. I’d suggest doing his core training at least 3 times a week in addition to your strength and cardiovascular training.