My trainer has changed my routine

Monday----
Bench Press 3 sets
Incline Press 2 sets
Front Shoulder 2 sets
Arnold Press 2 sets
Tricep Pulley 2 sets
Tricep Pushdown 2 sets

Tuesday----
Squat 3 sets
Leg Curl 2 sets
Lats Pulley 2 sets
Ground Pulley 2 sets
Shrugs 2 sets
Incline Dumbell 3 sets
Barbell Curl 2 sets
Wrist Curl 2 sets

Wednesday---- Rest

Thursday---- Same as monday

Friday---- Same as tuesday

Saturday---- Rest

Now is this routine good for gaining muscle size?
Also does abs exercise results in loss of muscle size?

Thanx