na, you'll be fine. Add all the abs work you want. Do it after workouts, on rest days, whatever.
The body has a TREMENDOUS capacity for work, and you'd be lucky to be able to push yourself even close to overtraining. You might struggle a bit with the increase in workload at first but you'll adapt to it, just like any other training stressor.
Check out the training schedules for Olympic weightlifters, those guys put some unbelievable gym time in and they do ok.
Thanks a lot.
For extra knowledge, this is what my back nad leg day look like.
2 day - the front and rear of the thigh, leg in Series
Squat lever, the lever withers 4 x 6-10
Leg press roller Notes 3 x 8-10
Colon squat machine, smith, 3 x 8-10
A leg extension for the roller Notes 3 x 10-12
Legs, arching prone roller Notes 3 x 8-10
Deadlift lever straight legs 3 x 10 -12
Sitting on the rim extension roller Notes 3 x 8-10
Jalapressil rim stretched 3 x 10-12
Rim standing dumbbell extension 3 x 8-10
- The back, shoulder, rear end, stomach Series
Chin pulling additional weight of 3 x 6-8
Snap a lever against the abdomen with a bent 3 x 8-10
Thrust roller Notes Ala, narrow grip 3 x 10-12
Over Dumbbell snatch (pullover) 3 x 8-10
Flying tilted forward dumbbells 3 x 8-10
Shrug block system 3 x 8-10
Lever Deadlift 4 x 8-10
Body Lift abdominal bench 3 x max
Body Turns roller Notes 3xmax
I used google translate to translate it all so i hope you understand what i mean