Fact: Running floods your body with cortisol, the hormone responsible for the 'runner's high', which also breaks down muscle into energy. Running, without proper nutrition after & before, can give you reducing gains. Which is why marathon runners don't have huge, muscular legs.
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And this further reinforces that jogging doesn't make you big and muscular, if have paid attention to typical Singaporean joggers. Do some HIIT (its just like sprint/rugby/soccer training) and balance out the muscular differences with gym training.