Here is my new Mass building workout. Pros/Cons? HELP

[Boxing11]

This is a 2 day split. I am going to try to buld so there will be no cardio. I play basketball once or twice a week so that will be my cardio. My questions about this is first, am I doing to much on day 1? Also are 2 day splits better than working out 1 muscle at each workout session? Is this to much or not enough if I want to put on muscle?

I am going to lift on Monday, Tuesday, Thursday, Friday.

Here it is......

Day 1 (Mon and Thursday)

Chest, Shoulders, Arms.

CHEST
Bench press-4 sets
Incline-4 sets
decline-3 sets
flys-3 sets

SHOULDERS
military press-4 sets
front lifts dumbbells-3 sets
back lifts dumbbells-3 sets ( sorry dont know the exact name of exercise)

BICEPS
Preacher curls-4 sets
power sets on cable machine-4 sets

TRICEPS
Nosebreakers-4 sets
power sets on cable machine-4 sets

forearm curls-3 sets


DAY 2 (tuesday and friday)

BACK
Lawnmowers- 4 sets
back machine-3 sets
shrugs-4 sets
lower back sit ups-4 sets

ABS
Crunches- 4 sets
leg lifts- 4 sets

Legs ( I cant do squats because of my back, pretty sad at only 21)
Leg press-4 sets
leg curls front-3 sets
leg curls rear-3 sets
calfs-4 sets

sorry, I dont know the actual name of alot of the exercises I do. please just ask if your not sure what I am talking about. I didnt list the amout of reps because I change it up alot. somedays I do maximum weight with low reps or somedays I dont max and do a few more reps. any input would help thanks.

[IronBender800]

Train each muscle once a week unless you want to do some sort of fullbody upper lower type split. Otherwise id break that up into a 3 day split training each muscle ONCE a week.

[Boxing11]

Wouldn't a 3 day split mean that I would only work each muscle once a week explain please?

[Boxing11]

sorry I read your post wrong. My question is that I heard that training a muscle only once a week gives it to long of a layoff and doesn't really force that muscle to grow?