Korn all the way. Squats, push ups, both fine.

Won't fix a really bad hernia.

I'm playing Orbit Culture now to boost my upper body strength session

The music half checks out. Fast loud tracks have been shown to extend exercise duration, and music in general can delay fatigue and raise work capacity, which means more reps on the bar. The squat half I'll leave to Limp Bizkit.

https://static.klipy.com/ii/c3a19a0b747a76e98651f2b9a3cca5ff/cc/32/8X21EKxi.gif