Yes any overtraining can be dangerous, there was an article about how one guy running startup got rhabdo while doing p90x: http://collegespun.com/features/how-t

Yes any overtraining can be dangerous, there was an article about how one guy running startup got rhabdo while doing p90x: http://collegespun.com/features/how-the-stress-of-running-a-startup-and-some-p90x-led-to-a-week-long-stay-in-the-hospital-with-rhabdomyolysis http://collegespun.com/features/how-the-stress-of-running-a-...