Weight lifting method

I feel i get a great workout by working out one body part a week, but the workouts are constant and very strenuis.

First week My upper body. I do my back, my arms and my chest. Now i also add it 500 crunches everyday but i do a diffrent ab exercise every day to switch it up. Now each day i work each body part bery hard to where after i finish i cant stand lol. Its hard but your muscles get a great work out and a long week to repair.

Second week i do my legs. Now i do the same thing my workouts for my legs everyday along with the 500 rep ab exercises. Then back to my first week round.

Cardio i dont usually do cardio untill after i built up alot then i got on a cut diet.

I do one body part a week too but I think I should change my current routine. 500 crunches every day? My X used to say that abs are 99% diet. Why do you overtrain them, jtrulow899? After all abs are a muscle like the others ...