diff --git a/README.md b/README.md
index fab4e4a..04fc747 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ Trail running focused Garmin watch DataField (for myself)
   - average
   - current
   - max
-  - gauge
+  - histogram
 - pace
   - current
   - average
diff --git a/TODO.md b/TODO.md
index f58b565..29bc45d 100644
--- a/TODO.md
+++ b/TODO.md
@@ -2,6 +2,5 @@
   - pace/speed based on sport
   - imperial unit support
 
-- hr gauge => hr zone distribution
 - track color => color coded by elevation gain/loss (or even vertical speed ?)
 - https://github.com/loukad/vertlover 
diff --git a/source/RepaFieldHeartRate.mc b/source/RepaFieldHeartRate.mc
index 6385cdc..9c5386f 100644
--- a/source/RepaFieldHeartRate.mc
+++ b/source/RepaFieldHeartRate.mc
@@ -6,33 +6,34 @@ import Toybox.System;
 
 class HeartRate extends WatchUi.Drawable {
 
-    hidden var hrZones as Array<Numeric>;
-    hidden var hrValue as Numeric;
-    hidden var aColor as Graphics.ColorValue | Number;
-    hidden var y as Numeric;
+    hidden var hrHist as Array<Numeric>;
+    hidden var hrZoneColors as Array<Numeric>;
+    hidden var hrTicks as Number;
+    hidden var y as Number;
 
     function initialize(params as Dictionary) {
         Drawable.initialize(params);
 
-        hrZones = [100, 120, 140, 160, 180, 200];
-        hrValue = 0.0f;
-        aColor = 0xFF8800;
+        hrZoneColors = UserProfile.getHeartRateZones(UserProfile.getCurrentSport());
+        hrHist = [0, 0, 0, 0, 0, 0, 0];
+        hrTicks = 0;
+
         y = 64;
         if (params.hasKey(:y)) {
             y = params.get(:y) as Number;
         }
     }
 
-    function setHRZones(zones as Array<Numeric>) as Void {
-        hrZones = zones;
+    function setHRZoneColors(zoneColors as Array<Numeric>) as Void {
+        hrZoneColors = zoneColors;
     }
 
-    function setHRValue(value as Numeric) as Void {
-        hrValue = value;
+    function setHRHist(hist as Array<Numeric>) as Void {
+        hrHist = hist;
     }
 
-    function setHRColor(color) as Void {
-        aColor = color;
+    function setHRTicks(ticks as Number) as Void {
+        hrTicks = ticks;
     }
 
     function draw(dc as Dc) as Void {
@@ -41,16 +42,16 @@ class HeartRate extends WatchUi.Drawable {
         var width = dc.getWidth();
         dc.drawLine(width * .1, 64, width * .9, 64);
 
-        var percentage = 0.0f;
-        var zoneNr = hrZones.size();
-        if (hrValue > hrZones[zoneNr - 1]) {
-            percentage = 1.0f;
-        } else if (hrValue < hrZones[0]) {
-            percentage = .0f;
-        } else {
-            percentage = (hrValue - hrZones[0]).toFloat() / (hrZones[zoneNr - 1] - hrZones[0]);
+        if (hrTicks == 0) {
+            return;
+        }
+
+        var drawFrom = 0;
+        for (var i = 0; i < hrHist.size(); i++) {
+            var drawTo = (drawFrom + width * hrHist[i].toFloat() / hrTicks).toNumber();
+            dc.setColor(hrZoneColors[i], Graphics.COLOR_TRANSPARENT);
+            dc.drawLine(drawFrom, y, drawTo, y);
+            drawFrom = drawTo;
         }
-        dc.setColor(aColor, Graphics.COLOR_TRANSPARENT);
-        dc.drawLine(width * .1, 64, width * (.1 + .8 * percentage), 64);
     }
 }
diff --git a/source/RepaFieldView.mc b/source/RepaFieldView.mc
index c4d030c..ea60640 100644
--- a/source/RepaFieldView.mc
+++ b/source/RepaFieldView.mc
@@ -13,6 +13,7 @@ class RepaFieldView extends WatchUi.DataField {
     hidden var themeColor2 as Numeric;
     hidden var themeColor3 as Numeric;
     hidden var hrZones as Array<Numeric>;
+    hidden var hrHist as Array<Numeric>;
     hidden var hrZoneColors as Array<Numeric>;
     hidden var cadenceZones as Array<Numeric>;
     hidden var cadenceZoneColors as Array<Numeric>;
@@ -36,6 +37,7 @@ class RepaFieldView extends WatchUi.DataField {
     hidden var fHrGraph;
 
     // values
+    hidden var hrTicks as Number;
     hidden var hrValue as Numeric;
     hidden var ahrValue as Numeric;
     hidden var mhrValue as Numeric;
@@ -62,6 +64,8 @@ class RepaFieldView extends WatchUi.DataField {
         ahrValue = 0;
         mhrValue = 0;
         hrZones = UserProfile.getHeartRateZones(UserProfile.getCurrentSport());
+        hrHist = [0, 0, 0, 0, 0, 0, 0];
+        hrTicks = 0;
         hrZoneColors = [Graphics.COLOR_DK_GRAY, Graphics.COLOR_LT_GRAY, Graphics.COLOR_BLUE, Graphics.COLOR_GREEN, Graphics.COLOR_YELLOW, Graphics.COLOR_RED, Graphics.COLOR_DK_RED];
         cadenceZones = [153, 163, 173, 183];
         cadenceZoneColors = [Graphics.COLOR_RED, Graphics.COLOR_YELLOW, Graphics.COLOR_GREEN, Graphics.COLOR_BLUE, Graphics.COLOR_PURPLE];
@@ -78,6 +82,19 @@ class RepaFieldView extends WatchUi.DataField {
         cadence = 0;
     }
 
+    function tickHr(v as Number) {
+        hrTicks++;
+        var hrzsize = hrZones.size();
+        for (var i = 0; i < hrzsize; i++) {
+            if (v < hrZones[i]) {
+                hrHist[i]++;
+                return;
+            }
+        }
+        // out of range
+        hrHist[hrzsize]++;
+    }
+
     function calculateZoneColor(v as Numeric, zones as Array<Numeric>, zoneColors as Array<Numeric>) as Numeric {
         for (var i = 0; i < zones.size(); i++) {
             if (v < zones[i]) {
@@ -134,6 +151,9 @@ class RepaFieldView extends WatchUi.DataField {
         fMHr = View.findDrawableById("mhr") as Text;
         fHrGraph = View.findDrawableById("HeartRate") as HeartRate;
 
+        // init fields
+        fHrGraph.setHRZoneColors(hrZoneColors);
+
         // theme setup
         fBgOverlay.setColor1(darken(themeColor, 4));
         fBgOverlay.setColor2(darken(themeColor, 2));
@@ -147,6 +167,7 @@ class RepaFieldView extends WatchUi.DataField {
     function compute(info as Activity.Info) as Void {
         if(info.currentHeartRate != null) {
             hrValue = info.currentHeartRate as Number;
+            tickHr(hrValue);
         } else {
             hrValue = 0;
         }
@@ -229,9 +250,8 @@ class RepaFieldView extends WatchUi.DataField {
         fMHr.setColor(darken(calculateZoneColor(mhrValue, hrZones, hrZoneColors), 2));
         fMHr.setText(mhrValue.format("%d"));
         if (fHrGraph != null) {
-            fHrGraph.setHRColor(hrColor);
-            fHrGraph.setHRZones(hrZones);
-            fHrGraph.setHRValue(hrValue);
+            fHrGraph.setHRHist(hrHist);
+            fHrGraph.setHRTicks(hrTicks);
         }
 
         // track
@@ -267,7 +287,7 @@ class RepaFieldView extends WatchUi.DataField {
             }
             if (fTimerSec != null) {
                 fTimerSec.setColor(darken(timerColor, 1.5));
-                fTimerSec.setText(trs.format("%02d"));
+                fTimerSec.setText(":" + trs.format("%02d"));
             }
         }