eagermuscle saidI'll never do it and I think at your age and weight you should approach with caution.
I've found that almost everyone who shares their experiences with P90X, Crossfit and other programs of that ilk online positively rhapsodize about them. Like a cult attracting like-minded people, it's great for those who prefer the camaraderie, support and pressure of training in a team environment.
Light birdlike people that make exceptional runners would probably be the least likely to injure themselves performing Crossfit, P90X, Insanity and other calisthenic bootcamp bodyweight exercises. But it's a bad idea for people like me with knee and joint problems, and a terrible one for the morbidly obese - I literally cringe during "The Biggest Loser" when all those contestants do jumping lunges to exhaustion. I'll never be a convert to that type of high impact, high intensity training. I totally get why some people like it having recently experienced a runner's high sprinting HIIT on a flexdeck treadmill but within a week my knees and back started hurting and a long-healed torn foot ligament started acting up. I'll stick with weights, yoga and HIIT on an elliptical and in the pool only.
Sorry, but that's a load of bullshit. "At his age?"
He's 48.....not 98. Maybe he should just go shoot himself, huh?
I'm older than the OP and I started in March of this year, and I'm in the best shape of my entire life now. I'm doing things that I couldn't even do as a kid. On many days I beat the pants off the 20 year olds too. Yeah, it's cult like and that's what makes it so much fun. That being said, it takes a particular type of personality to enjoy it. Fortunately, my personality is made for CrossFit. I was so bored with my regular gym.....everyone doing their stupid bicep curls in front of the dumbbell rack, staring in the mirror, afraid to make eye contact. Headphones stuck in everyone's ears, so forget about anything social taking place. I was feeling like I was working out in a library. CrossFit is the complete opposite. You'll never see anyone with headphones in their ears and this is the crazy part.....people will actually greet you when you walk in by your name!
But before you go, do this: Go to http://map.crossfit.com/
and make sure the place you're going to is an affiliate and not just some random place ripping off the CrossFit name. Go to an introductory class and ask about their safety measures. Some boxes are more safety oriented than others (like any gym.)