Going into an open gym without a game plan is one of the biggest fitness mistakes you can make, says Piskin. Not only is it overwhelming and distracting, but you'll easily spend a good chunk of your time trying to figure out what to do instead of actually using that precious time you've carved out for your workout.

"Create a weekly gym plan for yourself that becomes standard practice. You will maximize gym time with this approach and see results much faster," she says. "For example, Mondays are cardio either on the treadmill, bike, or elliptical. Wednesdays you do upper body and ab work with machines and free weights. Friday you do a circuit workout between cardio bursts and lower body."

A set plan means more time for your actual workout and better focus during each and every move.

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