init

lib/strength/stats.ts

@@ -1,5 +1,6 @@
 import type { StrengthExercise, StrengthWorkout } from "@/lib/models/strength";
 
+
 export function exerciseVolumeKg(exercise: StrengthExercise): number {
   return exercise.sets.reduce((sum, set) => sum + (set.weightKg ?? 0) * (set.reps ?? 0), 0);
 }
@@ -11,6 +12,17 @@ export function exerciseTopWeightKg(exercise: StrengthExercise): number | undefi
   return weights.length > 0 ? Math.max(...weights) : undefined;
 }
 
+// Epley formula: weight × (1 + reps / 30). Returns best e1rm across all sets.
+export function exerciseE1rm(exercise: StrengthExercise): number | undefined {
+  let best: number | undefined;
+  for (const set of exercise.sets) {
+    if (set.weightKg == null || set.reps == null || set.reps < 1) continue;
+    const e1rm = set.weightKg * (1 + set.reps / 30);
+    if (best === undefined || e1rm > best) best = e1rm;
+  }
+  return best !== undefined ? Math.round(best * 10) / 10 : undefined;
+}
+
 export function workoutVolumeKg(workout: StrengthWorkout): number {
   return workout.exercises.reduce((sum, exercise) => sum + exerciseVolumeKg(exercise), 0);
 }
@@ -19,6 +31,7 @@ export type ExerciseHistoryPoint = {
   date: Date;
   volumeKg: number;
   topWeightKg?: number;
+  e1rmKg?: number;
 };
 
 /**
@@ -38,6 +51,7 @@ export function getExerciseHistory(
       date: workout.date,
       volumeKg: exerciseVolumeKg(exercise),
       topWeightKg: exerciseTopWeightKg(exercise),
+      e1rmKg: exerciseE1rm(exercise),
     });
   }