But not everybody can, and not everyone has the judgment to make that decision.
I feel like Insanity is targeted to people already in shape, and P-90X also has a precursor that he recommends for beginners.
Slow progress makes sense for fitness, but sometimes you plateau and need something fresh. At some point, taking a walk, doing some sprints and doing body weight exercises may get old. You might not have access to a gym. The Beachbody stuff gives you alternatives.
I also think that the person who tries to keep up with Shaun T and gets hurt on their first day of Insanity is the same one that shows up at the gym and tries to dead lift too much weight before learning form, that ends up with a blown out knee from adding mileage too fast on running etc. etc. etc.
Yeah, my wrist started to hurt. And when I did the PB body weight, my hip got sore. When I ran, I had lower back issues. My hip gets a little sore with my current class. Horseback riding hurts my back. You do need to tolerate some aches and pain in life if you want to be active.