No, it's possible to set up a 'most points' challenge type, as opposed to our classic 'most kms' challenge. In a most points challenge, to level the playing field, the activities are automatically weighted by GoJoe - see here further.
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The standings can also be filtered (whether in a 'most points' or 'most km' challenge) by activity type and, in any event, it's a team game. Anyway, it's also surprising how regular walking, for example, clocks up the kms.