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The best tool for awesome arms: Resistance band

Awesome-arm move: Tricep Kickback

Here's why: Toned triceps are what give you killer-looking arms when you go sleeveless, and the kickback is the easiest move to do with perfect form—key to getting good results. "Using the band allows you to isolate your triceps and truly target the smaller muscles that are often difficult to involve when using traditional weights," Braganza says. "Plus, the stretchy material gives more resistance at the top of the move, forcing your muscles to work harder."

Next: How-to: Tricep Kickback