MHR: A rough calculation of your maximal heart rate by your age is 194. At around 130 you are at a 70% of your maximal heart rate at the target zones of training. Longer you stay more fat burning will happen at that zone. If you are building muscle and endurance not good to stay long at that zone. Well use training target heart zones can help you plan your goals.
Answered 5/27/2013
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