diff --git a/requirements.txt b/requirements.txt
index 490757e..ceae4a5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 lxml
 requests
 garth
+setuptools
diff --git a/withings_sync/garmin.py b/withings_sync/garmin.py
index e17b286..ae5f455 100644
--- a/withings_sync/garmin.py
+++ b/withings_sync/garmin.py
@@ -1,56 +1,52 @@
 """This module handles the Garmin connectivity."""
+
+import io
 import logging
-import garth
 import os
-import io
 
-log = logging.getLogger("garmin")
+import garth
 
+log = logging.getLogger("garmin")
 
-HOME = os.getenv('HOME', '.')
-GARMIN_SESSION = os.getenv('GARMIN_SESSION', HOME + '/.garmin_session')
+HOME = os.getenv("HOME", ".")
+GARMIN_SESSION = os.getenv('GARMIN_SESSION', os.path.join(HOME, ".garmin_session"))
 
 
 class LoginSucceeded(Exception):
-    """Used to raise on LoginSucceeded"""
+    """Raised when login succeeds."""
 
 
 class LoginFailed(Exception):
-    """Used to raise on LoginFailed"""
+    """Raised when login fails."""
 
 
 class APIException(Exception):
-    """Used to raise on APIException"""
+    """Raised for API exceptions."""
 
 
 class GarminConnect:
-    """Main GarminConnect class"""
+    """Main GarminConnect class."""
 
     def __init__(self) -> None:
         self.client = garth.Client()
 
     def login(self, email=None, password=None):
-        logged_in = False
         if os.path.exists(GARMIN_SESSION):
             self.client.load(GARMIN_SESSION)
-            try:
-                self.client.username
-                logged_in = True
-            except Exception:
-                pass
-
-        if not logged_in:
-            try:
-                self.client.login(email, password)
-                self.client.dump(GARMIN_SESSION)
-            except Exception as ex:
-                raise APIException("Authentication failure: {}. Did you enter correct credentials?".format(ex))
+            if hasattr(self.client, "username"):
+                return
 
+        try:
+            self.client.login(email, password)
+            self.client.dump(GARMIN_SESSION)
+        except Exception as ex:
+            raise APIException(
+                f"Authentication failure: {ex}. Did you enter correct credentials?"
+            )
 
     def upload_file(self, ffile):
-        """upload fit file to Garmin connect"""
-        # Convert the fitfile to a in-memory file for upload
+        """Upload fit file to Garmin Connect."""
         fit_file = io.BytesIO(ffile.getvalue())
-        fit_file.name = 'withings.fit'
+        fit_file.name = "withings.fit"
         self.client.upload(fit_file)
         return True
diff --git a/withings_sync/sync.py b/withings_sync/sync.py
index dca4363..e874d00 100644
--- a/withings_sync/sync.py
+++ b/withings_sync/sync.py
@@ -297,6 +297,9 @@ def prepare_syncdata(height, groups):
             collected_metrics = "weight data"
             if "BLOOD_PRESSURE" in ARGS.features:
                 collected_metrics += " or blood pressure"
+            elif "diastolic_blood_pressure" in group_data:
+                collected_metrics += ", but blood pressure (to enable sync set --features BLOOD_PRESSURE)"
+
 
             logging.info(
                 "%s This Withings metric contains no %s.  Not syncing...", dt, collected_metrics
@@ -478,8 +481,10 @@ def sync():
                 # Save this sync so we don't re-download the same data again (if no range has been specified)
                 if not ARGS.fromdate:
                     withings.set_lastsync()
-        else:
+        elif ARGS.garmin_username is None:
             logging.info("No Garmin username - skipping sync")
+        else:
+            logging.info("No Garmin data selected - skipping sync")
     else:
         logging.info("Skipping upload")
     return 0