D.M.
Hi J.,
The resident Personal Trainer here.... You don't need expensive equipment or classes, just get down and do some good old fashioned push-ups.
Of course, as we all know, you cannot 'spot train', which means to tone just one area. But when you're talking about the arms, you want to train everything. Biceps (front of arm), Triceps (those 'wings') and shoulders.
And, you really do need to focus on the whole package, the 3-sided equation of fitness. Cardio, Muscle, and Flexibility.
Anyway, you would be amazed at what a basic push up will do for you. When I'm coaching people on how to train up to doing full push ups this is my advice:
1. Start on your hands and feet. Yes, it's hard. Yes, you can only do 1 or 2. Tomorrow you'll be stronger and can do more.
2. Your hands should be right below your shoulders so that your body is in a "Plank" position. As you lower down, slide your elbows close to your body so that you really focus on those triceps (chest & biceps too!).
3. In order to build up your strength, from the top of the push up (plank) come all the way down to the floor and drop your body. THEN, push back up to the top. You need to train those muscles through the full range of motion.
If you have more questions, go onto youtube.com and google push ups. You're guaranteed to find lots of info.
GL to you!