Enrolling starts the count at zero.
Rucks you have already logged stay in your history but do not count here — the point is the walking you do from now on. There is no deadline and nothing expires underneath you.
Counts consecutive weeks with at least one ruck. An empty current week does not break the run; a missed past week starts it again.
Counts consecutive weeks with at least one ruck. An empty current week does not break the streak — there are still days left in it. A missed past week starts the count again.
Rucks imported from Strava never count toward a challenge. Progress and the badges it earns are shown on public profiles, and Strava’s API terms allow their data to be shown only to the person it belongs to — so the same rule that keeps those rucks off the keeps them out of here.