How to burn fat most efficiently?

Right now, I'm 5'7" (maybe a little taller) and 121-123 pounds. I was at 129, but I've dropped some weight.

I know I sound like I'm just fine because my BMI is 18.9, but I have a little bit of fat I'd like to burn off to tone up before summer. It's not a lot, but I'd just like to start a healthier lifestyle so I'm still in shape for tennis in the fall.

I already do at least 45 minutes of intense cardio once per week, sometimes twice. My current mile time is under 10 minutes and I can run the whole thing, so I'm not really out of shape at all.

If someone on here knows of any good things to do for cardio to burn fat, I have access to both an elliptical and a treadmill.

Also, I'm open to trying new types of workouts to tone my inner thighs and stomach.

Thanks in advance!
How to burn fat most efficiently?
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