Is it bad to do p09x and go to the gym?

Answer 1

"Overtraining syndrome frequently occurs in athletes who are training for competition or a specific event and train beyond the body's ability to recover. Athletes often exercise longer and harder so they can improve. But without adequate rest and recovery, these training regimens can backfire, and actually decrease performance.

Conditioning requires a balance between overload and recovery. Too much overload and/or too little recovery may result in both physical and psychology symptoms of overtraining syndrome."

It would not be good to do P90x and go to the gym. P90x is a complete workout program if you want to see the results you need to stick with the program as it is laid out.