A collection of stretches (laps, splits, a group of laps). Not itself a section: the gaps between its members (a rep's recovery) belong to none of them, and its stats leave them out.
The member at index (negative counts from the end), if any.
index
The members grouped by key, in the order each key first appears.
key
The numbers across the members only. Pace is their total distance over their total time; timer time is known only when it is for every member.
A collection of stretches (laps, splits, a group of laps). Not itself a section: the gaps between its members (a rep's recovery) belong to none of them, and its stats leave them out.