There was a long time when I did tons of different arm exercises all of which focused on a very deficit muscle group. I saw gains but I got really bulky and my arms never really took on that long lean strong look that I was going for.
I did some exercise and realized that I was woking out wrong. Trying to lift all these massive weights with isolated muscles just gave me bulky and unlean muscles. I had to do full body exercise that engaged my core and boosted my heart rate.
Now I do a circuit of bodyweight exercise that includes burpees, mountain climbers and lots of different kinds of pushups. I have busted through the plateau I had reached and I have never looked or felt better. I'm finally getting the body I want and I did it by ditching the gym.