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Your XFINITY Connect session has timed out due to inactivity. Click here to go back close 10 Common Workout Mistakes – How Many Are You Making?

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FAIL: Channeling Jane Fonda

Remember big hair and leg warmers? If you do, you likely also remember aerobic class moves like the hydrants, leg lifts and side bends. Some are tried and true, others are potentially dangerous or, at best, useless, says Rubenstein. "Many were based on the spot reduction theory, where women believe they can reduce a specific area on their body simply by working that muscle, which simply isn't true." Other moves are performed so fast they don't allow enough time under tension to produce strength results and may even be fast enough to injure the hip joint. Your best bet? Update your workout and leave the Flash Dance moves in the 80s.

(CREDIT: Dennis Hallinan/Archive Photos/Getty Images)
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