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Anonymous
>>173151 Oh, no problem. Honestly, unless you have heart problems (which you should be fine at your age for), you can't really push too hard with cardio. If you go too far, you'll just feel lightheaded, dizzy and exhausted and you'll just need to take a break.
That's why I suggest the heart-monitor. If you push yourself at 165bpm for an extended period, you will burn a lot of fat, yes, but you may only be able to maintain that for 2-3 minutes before collapsing and having to retire. If you push yourself to something difficult, but slightly under that like 150, then when you cannot push any more, you do a light song and when your heart rate starts to drop below 135, kick it up a notch again and try to get it back up to 150. Keep volleying it back and forth in that 140-160 range for as long as you can stand.
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