diff --git a/wger/manager/api/serializers.py b/wger/manager/api/serializers.py
index 4873edeea5..2eecebcfe8 100644
--- a/wger/manager/api/serializers.py
+++ b/wger/manager/api/serializers.py
@@ -446,6 +446,10 @@ class Meta:
             'rir_target',
             'rest',
             'rest_target',
+                        # --- NEUE FELDER ---
+            'bpm_max',
+            'bpm_avg',
+            'duration',
         )