Workout Routine to Add Mass?

I’ve been training a full body workout routine for 8 weeks now. Gained a lot of strength and wanting to switch my routine up to isolated workout such as chest/abs day, back day, shoulder day, leg day, and arm day. Training cardio twice a week don’t have too much fat to burn as I’m a slender guy and looking to add mass. Any help with routines would be very much appreciated.
This is a routine I have found I am very familiar with most of the exercises just wanting some opinions. Thanks.
Chest/abs Day. Bench press, incline dumbbell press, hammer strength wide bench machine and dumbbell flys. Air bikes, captain chair raises, ab pull downs “cable machine”
Shoulder day. Seated overhead dumbbell press, upright rows, shrugs, dumbbell side lats.
Back day. Pull ups, Deadlift, lat pull downs, one arm rows T-bar rows
Leg day. Squats, leg press, lunges, leg curls, leg extensions.
Arm day. Bicep curls EZ bar. Preacher curls, incline dumbbell curls, drag curls, skull crushers, tricep pressdowns, close grip bench.

Try this…

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What’s wrong with full body?

Literally any program on this site is better then the one mentioned… do some reading and make a choice. Stay with this choice for 6 months.