I used to be lazy and not workout because I wasn't doing it properly and would get muscle fatigue and tired, sometimes injured.

One day I took the time to research proper form for exercises and the adequate frequency for my body type. You can't just rely on your "bro" to teach you because you may have different physiology.(a lot of personal trainers are "personal trainers" because they can't get a real job too)

I did not get huge right away, but what ends up happening is that your natural posture improves rapidly and you look wide on your shoulders if you do the proper back and chest exercises.  I strongly believe that posture is what makes a person more attractive, and people notice right away.  It is the "air" or confidence that good posture projects. 

You don't need to spend thousands of hours at the gym to give the appearance of having broad shoulders, you just need to do the proper exercises and avoid those that work against your objective.     The purpose of this exercise routine is to "fill up your jacket".