So I was wondering if it would be a good idea if you changed your routine every time you work out. Is it like intense muscle confusion or is it a bad idea?
You can, but changing EVERYthing in a session EVERY time you train that particular body-part is not the best idea. You should be aiming for PROGRESSION each time you do a body-part and/or exercise and doing as you asked would NOT give that. Things that can be adjusted include weight, reps, sets, exercises (adding in or taking out), order of exercises, recovery periods, etc.
~Rosie
Team APPNUT