burning fat and heart rate...

[WarriorPL]

Do you start burning fat once you get to a certain ammount of heart beats per minute??? I mean because everyone says you don't start burning fat till about 45 minutes of running... and thats all i could come up with. am i on the right track??
Pls no flames if im way off, but hey im a when it comes to cardio.

 

[15yroldinNY]

Doing any kinds of cardio is positive IMO, its just if you want the awesome results, go for an hour. When your down to the last 15 minutes just think of WARLOBOS post.

 

[bignate73]

karvonen formula, that should help.

theories on WHEN vary from anywhere from 6 min to 15-20.

 

[FitnessFrk]

when it comes to burning fat and getting lean it's all about calories in vs. calories out....

take in less calories then your body needs to sustain it's current weight and activity level you will lose weight...raise your protein intake while "lowering" carbs will keep the hard earned muscle that you have..