6. Arm Circles

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This is another great exercise for slimming your arms, and it's super easy. Hold your arms straight out to either side of you – and make circles! Be a windmill! As a kid in gym class, you probably thought this was the dumbest exercise ever, but it's really helpful. Start out circling your arms to the front; begin with tiny circles, then work your way up to bigger ones. There are no real reps with this, so do it for 3-5 minutes, then reverse direction and repeat.

Diagonal Raises
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