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Anonymous
How does /fit/ feel about the "Fat Burn" mode on a treadmill and what's a good target heart rate for someone whose 5'9", male, and 140 lbs looking for a light-medium workout?
>> Anonymous
Good target heart rate is as high as possible. 190-195 bpm, maybe? Google HIIT.
>> Anonymous
HIIT is preferrable, though a little difficult on a treadmill.

Assuming you're in your early twenties, OP, your target heart rate is going to be in the 145 region. Always better to up the intensity if you can manage it, though.
>> Anonymous
Kinesiologist here...

We've researched various cardio methods for a while now and found whats actually superior ... I'm surprised HIIT is still getting this kind of attention.

http://www.themedicalhelp.com/forum/viewtopic.php?f=40&t=247

TL;DR (or you're too lazy to register) Running releases fat burning hormones, but the act of running itself does not burn fat - it uses glycogen stores to continually power muscle contractions, combining the waste product - lactic acid - with oxygen to process energy for further contractions.

Running does not burn fat, it burns sugar.

Walking on the other hand burns lots of fat, but doesn't provide you with the same fat burning hormone release as running would. So the solution is simple:

Run as fast and hard as you can for 15 to 20 minutes straight, then cut that speed and walk briskly for 30 minutes.

There is simply no better way to burn more fat than this. Study after study has proved this (you can find the studies included in the link).