Translation:They usually go running or hiking on Sundays.
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Well, male or female, at least (as it also applies to children, not just to adults), but I believe the question was about when we hear the sentence out of context, as Duolingo was marking only one pronoun correct.
There's simply no way to know without context, of course, and it doesn't really matter with spoken Chinese anyway, because the pronunciation is the same.
(Incidentally, the feminine "她" in writing is a relatively recent phenomenon in Chinese, and is influenced by Western literature.)