People have been using the size of their arms and evidence of a six pack to show how physically fit they are for decades. Many people new to training have these goals in mind when they first enter the gym. Heck, there's a reason why the Shake Weight sold so well (people want nice arms)! However, often times these goals and the execution to get them gets convoluted.
People think to get big arms you simply need to do an excessive amount of bicep curls. This leads beginners to come up with training programs that revolve around isolation movements to train one particular muscle. There are a few things wrong with this mindset.
First, most of us would agree that the triceps take up a large majority of your arm and also would require sufficient training. Another issue with this is that it's not often you see relatively smaller frame people with extremely large arms (unless your name is Popeye). But perhaps the biggest issue is that they tend to give priority to these isolation movements over compound ones.
Ok so you want big arms? Do yourself a favor and find a person who has your ideal set of arms or whatever other body part you'd ideally want (hey keep it clean, this is a family friendly blog!). Now after you get done identifying that body part, take a look at the rest of their physique. Chances are if they have big arms, they also have a big back, big chest and big legs.
The body does a great job at staying proportionate. If you want big arms your best bet to work on improving your overall physique. This is done through compounds!
Think of a sculptor carving a statue out of block of granite. Where are they likely to start? If you answered with getting a basic shape then you'd be correct. They always work on the largest items first before going back and fine tuning some of the more intricate details.
I urge you to prioritize your training in the same way. Focus on the big compound movements first to give your body the overall shape you'd like, and then go back in with isolation movements to finish things off. Doing so will allow you to sculpt the body you want (and get the arms or abs of your dreams).