diff --git a/app.py b/app.py
index af5af14..6960b14 100644
--- a/app.py
+++ b/app.py
@@ -189,12 +189,10 @@ def workouts(user_id):
             workout.distance = distance
 
         if heart_rate_readings:
-            average_bpm = sum(h['bpm'] for h in heart_rate_readings) / \
-                len(heart_rate_readings)
-            min_bpm = min(
-                h['bpm'] for h in heart_rate_readings)
-            max_bpm = max(
-                h['bpm'] for h in heart_rate_readings)
+            bpm = [h['bpm'] for h in heart_rate_readings]
+            average_bpm = sum(bpm) / len(bpm)
+            min_bpm = min(bpm)
+            max_bpm = max(bpm)
 
             workout.is_heart_rate_available = True
             workout.average_bpm = average_bpm