I just started working out three months ago, making the first real attempt in my life to get into a serious workout routine. I've always had skinny little arms and have trouble building muscle in general. After having put in a few months, I have noticed some results; however, I'm having a lot of trouble with my front deltoids, the left one in particular. I've been doing front raises and various other shoulder exercises, but the left front delt just isn't really going anywhere. Now, I should probably emphasize that I have BONEY shoulders, and my left arm is significantly weaker than my right. I guess my real question here is if there's an effective way to train my weak shoulder that is a little more beginner-friendly. When I do front raises, I can do about ten reps with a light weight, but after that I literally can't raise my arm anymore. I'm also worried that when doing raises, my shoulder is so weak that I'm not using proper form. Any ideas?