Balance, grasshopper.
If you only teach your body to to burn stored fat, you'll never build your heart muscle (aka, step one). You need to also challange your heart to improve, which leads to an increase your your max heart rate(step two). You do that effectively by by developing in step one and then challenging in steps two. The result is a stronger heart and a higher heart rate for step one. All that leads to better conditioning and a part of that is stronger muscles, which leads to more fat burning.
So, my point is balance. Also, the term sprint is used just to show yo are pushing your heart rate near the max. You can do so with nearly any aerobic activity. I for one hate running but love a bike and especially a spin bike. I also mix in an eliptical trainer on off cycling days. And don't forget that heart monitor!!
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If you're wringing your hands you can't roll up your shirt sleeves.
Stangers have the best candy.
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