You probably already know that swimming burns more calories than walking, but did you know that walkers tend to lose more weight? That's because the coolness of the water seems to slow fat loss. Swimming's great exercise, so if you love it, keep on doing it. But there are plenty of other great tips for maximizing your workout in this quiz over at AOL Health.

No one wants to waste time and energy on a workout that's not going anywhere. If you're looking to create an efficient cardio workout that maximizes the number of calories burned, here are some tips:

• Head for the hills: Whether you're on treadmill or trail, hills instantly boost the intensity of a workout, making your muscles work harder and burn more calories.
• Try intervals: Interval training or speedwork is an easy way to maximize a workout.
• Add in arm work: Using your arms when you walk will increase your speed and make you work harder too. Just be sure to keep your arms in close to your body, bent at a 90 degree angle.
• Eat a healthy diet: Overeating packs on pounds, but under-eating will quickly undermine your workout too.

What workout tips and tricks give you the biggest bang for your cardio buck?