Make the "challenge" user edited
I was surprised to find that there was a limited drop-down list of what one's publicly displayed "challenge" is--what it is we're getting SuperBetter at or from. Not on this list is work-life balance, relationships, parenting, mental wellness, overcoming isolation or anything really remotely like the challenges I was actually hoping to overcome through your program. If we can fill in our own epic goal, why not our own challenge? It seems needlessly narrow to provide a pre-set list that your users then find themselves not identifying with or wanting to use. Why provide a barrier to participation as part of the sign-up experience?