Big exercises build big arms. You can isolate your biceps and triceps as often as you’d like with low-weight exercises like kickbacks and concentration curls, but it’s compound moves, using heavy loads, that will make your arms grow.
Take a look at the workout below. The first exercises you’ll see on each training day are relatively big arm movements like weighted bench dips, skull crushers, and barbell curls. The lighter stuff comes last, when your arms are too spent to do much more. Gaining mass and size is all about priorities, and if your objective is to build bigger arms, start with big moves and finish with smaller ones.