diff --git a/src/pages/workouts/components/WorkoutItem.vue b/src/pages/workouts/components/WorkoutItem.vue
index 8806bd9..bc531c3 100644
--- a/src/pages/workouts/components/WorkoutItem.vue
+++ b/src/pages/workouts/components/WorkoutItem.vue
@@ -213,6 +213,23 @@
         <span class="workout-chart-readout" v-if="readoutValue[config.key]">
           {{ readoutValue[config.key] }}
         </span>
+        <span
+          v-if="config.key === 'power' && powerZones"
+          class="power-zones-legend"
+        >
+          <span
+            v-for="zone in powerZones"
+            :key="zone.label"
+            class="power-zone-chip"
+            :title="zone.label"
+          >
+            <span
+              class="power-zone-color"
+              :style="{ backgroundColor: zone.color }"
+            ></span>
+            {{ zone.label }}
+          </span>
+        </span>
       </h4>
       <LineWithLineChart
         :ref="(el) => setChartRef(config.key, el)"
@@ -289,6 +306,11 @@ import {
 
 import LineWithLineChart from "./LineWithLineChart.js";
 import ChartGroup from "./ChartGroup.js";
+import {
+  PowerZonesPlugin,
+  ftpToZones,
+  type PowerZone,
+} from "./PowerZonesPlugin.js";
 import type { LngLat, YMap } from "@yandex/ymaps3-types";
 import {
   YandexMap,
@@ -456,6 +478,22 @@ const sectionBounds = computed<
   return bounds;
 });
 const activeSection = ref<number | null>(null);
+// Power zones keyed by FTP; FTP is not a separate field, so the average
+// power is used as the FTP heuristic (Strava-style). Null -> no heatmap.
+// Absolute watt bounds do not depend on the x-axis mode, so the result is
+// memoized per FTP value (computed cache + no re-allocation).
+let powerZonesFtp: number | undefined | null = NaN;
+let powerZonesMemo: Array<PowerZone> | null = null;
+const powerZones = computed<Array<PowerZone> | null>(() => {
+  const ftp = workoutItem?.power;
+  if (ftp !== powerZonesFtp) {
+    powerZonesFtp = ftp;
+    powerZonesMemo = ftpToZones(ftp);
+  }
+  return powerZonesMemo;
+});
+// Expose the memoized zones to the shared plugin instance (read at draw time).
+PowerZonesPlugin.zones = powerZones;
 // Inner section boundaries (point indexes, never 0 or the last point).
 const sectionBoundaries = computed<Array<number>>(() =>
   sectionBounds.value
@@ -558,6 +596,10 @@ const chartPlugins = [
       }
     },
   },
+  // Power-zone heatmap: shared instance for all charts; the hook no-ops on
+  // every canvas except the power one (dataset label check). The zone list
+  // is exposed through the shared object, same pattern as the mapX ref.
+  PowerZonesPlugin,
 ];
 /** X scale per mode: time scale for "time", plain meters for "distance". */
 const xScaleOptions = (mode: XAxisMode): Record<string, unknown> => {
@@ -1101,4 +1143,24 @@ h3 {
   font-weight: normal;
   color: #07c;
 }
+.power-zones-legend {
+  display: inline-flex;
+  flex-wrap: wrap;
+  gap: 4px 8px;
+  margin-left: 10px;
+  font-size: 11px;
+  font-weight: normal;
+  color: #555;
+}
+.power-zone-chip {
+  display: inline-flex;
+  align-items: center;
+  gap: 3px;
+}
+.power-zone-color {
+  display: inline-block;
+  width: 10px;
+  height: 10px;
+  border-radius: 2px;
+}
 </style>