Module stats 

Structs

AllStatsVisitor

Single-pass visitor that collects all stats.

ExerciseStats

ExerciseVolumeCalculator

Volume for a specific exercise name only.

RepCounter

Sums all reps across all sets.

SetCounter

Counts all Set (Leaf) nodes in the tree.

TreeStats

Combined stats result – computed in a single tree walk.

VolumeCalculator

Sums weight * reps across all sets, normalised to kg.

Functions

compute_tree_stats

Compute all stats for a workout tree in a single pass.

estimate_1rm

Epley formula: 1RM = weight * (1 + reps / 30)