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^^ Someone correct me, but having your heartrate at 160-170 for 30 minutes straight doesn't sound healthy.
As for ellipticals, i stopped using them altogether unless i am recovering from injury.
Good thing about ellipticals is that it is extremely low impact. However, your workout is only about 40% effecient considering your weight does most of the work on an elliptical. The moment your body weight pushes one of the footpods down, the other footpod is automatically lifted.....so really, the majority of your workout is compromised. But for starting levels, its a great way to start.
Running whether its on a treadmill or outdoors is full range motion. No cardio is supposed to be 'high-impact,' but if you are running and it feels like its high impact....you want to be questioning your motion as it could lead to injury. But in running, you are lifting your own body weight and projecting with each step unlike an elliptical.
But if your diet is pristine and you want to be losing belly fat.....well intervals have already been mentioned.
On top of that you want to look into a core routine....NOT to be confused with an 'AB' routine. So pretty much look for a routine that includes squats, kettlebells, planks, mountainclimbers....etc. Not the excercises that you are gonna find on the AbRipperX on P90x.
Once (sometimes twice) a week, i have been doing plyometrics at the gym. Its something you can do for a good hour with LOTS of breaks in between and it will still feel like you ran for an hour or two. Plus, plyometrics (as well as core) is very sports functional as well. Not to be rushed into right away as plyometrics is very high impact, especially if you don't have the strongest knees.
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