Is that a program that someone who has been lifting weights for about three months would be okay to do?
Also, I’m trying to make my shoulder blades not stick out as much and I’ve been to told target the rhomboids and the serratus muscle. Would it okay to add one exercise to the stripped down hypertrophy routine to work the serratus muscle?
This type of program would provide a good base to build on. Adding extra exercises to work on your specific weaknesses is appropriate.
The Upper body horizontal pull will work your rhomboids but you may want to give it a little extra focus by adding and extra set or 2. Bent-over row with pronated grip and elbows out would be a good choice.