45 minutes a day of cardio...

Another intersting tid bit I found on Anabolic Review, was that more than 20 minutes a day of cardio won't burn muscle, IF I stay below my target heartrate.
(220-age x .7= target HR correct?)

Is this true? If so, does that mean I can still do 20 minutes of hard cardio, or must I stay below THR at all times?

Thanks,
Keith
 
45 min a day at low intensity, 65-75% of your max HR, will yield great fat burning results, especially in a fasted state.
 
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