Thanks so much for your reply, however that's for my daily steps.
I am trying to, kind of create a "weekly challenge" like walk 15km in 7 days..
So on the create page, it says "create individual challenge" ... Then it's asking me to "invite" Others.. Then it becomes a group challenge rather than for myself
Challenges are for groups of people. Individual challenge is were all the invitees verse each other whilst the other option (Team) is where you put the people who have joined the challenge into groups and the groups verse each other.