Arm Training Tips:
Always, always keep your midsection firm and your back straight - don't slouch.
Breath out at the hardest point of your exercise. Never hold your breath as it can cause dizziness as well as making you feel quite ill.
Don't train too heavy. Because our biceps are normally quite a bit stronger, compared to our other muscles, we tend to use weights that are often too heavy for us.
If you are swinging your weights up,
arching your lower back, and grunting like there is no tomorrow, you should probably reduce the weights you are using. I know "everyone else does it" but I am telling you correct form (performing the exercise correctly) will get you better results. Get someone to help you (or spot you) if you want to train really heavy.
Training your triceps. So "the back of your upper arms are floppy and you can't stand summer because you have to wear shorts sleeves." Sound familiar? Yep? Train light to start with. Unlike your biceps your triceps aren't often used. So make sure "performing your tricep exercises correctly" is at the top of your tricep workout list.
If you suffer from back pain perform your arm exercises seated. At most gyms now you will find Seated Bicep Curl Machines and Seated Tricep Extension Machines. Adjust the seat pad and the back pad to suit your height.
When using dumbbells make sure the bench you are using to train your biceps and triceps has a back pad on it to support your back. Also make sure your feet are either planted firmly into the floor or on the foot pads on the bench.
Include your arm workout as part of an exercise routine that includes your whole body. If you are going to show your arms off for summer you might as well show your legs too.
Your workout should always goes hand in hand with a low fat eating program as well as cardiovascular exercise - that is, if you really want to kick butt and acheive decent results.