Pain is good, right?

I thought I was in reasonably good shape. I mean, I run half-marathons in reasonable time (sub-two hours), so how out of shape could I be?

Well, last week I started the P90X system to try to get my weight down a bit and to work my muscles more than what I get from just running. I'm off to a decent start, but I've certainly learned that I no longer have any upper body or core strength (It has been a long 16 years since I did gymnastics in college). After a week of the classic p90x routine, I am sore. Today's workout was Chest and Back with "Ab Ripper X" (which should have been called "Ass Kicker X"). Some of the push ups and pull ups really did me in, but where I really struggled today was with some of the core exercises, particularly where I needed to raise my upper body off the ground.

I've been a bit sore over the past week, but it is a good pain. Overall, I feel energized and good. I've been sitting more upright and am looking forward to seeing progress over the next few weeks.