i searched the internet about this and i don't know what to believe. there are people saying running is usefull for dieting and harmless but there are also people saying it's not good for heart. they say it makes the heart bigger. which one is true?
and the other thing i wanna ask about is the running time. a lot of people are saying you start to burn fat after you run for at least 20 min. is it useless to run for like 10-15 min or is it just a myth?
i'd glad if you help me with these. thanks in advance.
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