diff --git a/backend/app/workers/tasks.py b/backend/app/workers/tasks.py
index 22e9db8..0f67f77 100644
--- a/backend/app/workers/tasks.py
+++ b/backend/app/workers/tasks.py
@@ -530,6 +530,13 @@ def detect_route(activity_id: int, user_id: int):
     return {"status": "no_match"}
 
 
+# Personal records are only computed from device-recorded FIT files (Garmin and
+# other GPS watches/head units). Phone- and Strava-sourced GPX/TCX imports —
+# especially older ones — suffer GPS "teleporting" that fabricates impossibly
+# fast splits, so they're excluded from PRs entirely.
+PR_ELIGIBLE_SOURCE_TYPES = {"fit"}
+
+
 @celery_app.task(name="compute_personal_records")
 def compute_personal_records(activity_id: int, user_id: int, parsed: dict):
     """Calculate personal records for standard distances from this activity."""
@@ -539,6 +546,10 @@ def compute_personal_records(activity_id: int, user_id: int, parsed: dict):
     from sqlalchemy import select
     from datetime import datetime, timezone
 
+    # Only FIT (watch-recorded) activities are trusted for PRs — see note above.
+    if parsed.get("source_type") not in PR_ELIGIBLE_SOURCE_TYPES:
+        return {"status": "skipped_non_watch", "activity_id": activity_id}
+
     data_points = parsed.get("data_points", [])
     total_dist = parsed.get("distance_m", 0) or 0
     sport = parsed.get("sport_type", "running")
@@ -1188,8 +1199,9 @@ def backfill_indoor_distances(user_id: int):
 @celery_app.task(name="recompute_personal_records_all")
 def recompute_personal_records_all(user_id: int):
     """Wipe and rebuild all personal records from stored activity data, excluding
-    indoor (no-GPS) runs whose distance is unreliable. Fixes records polluted by
-    treadmill over-measurement and any duplicate current-record rows."""
+    indoor (no-GPS) runs and non-watch (GPX/TCX) imports whose distance is
+    unreliable. Fixes records polluted by treadmill over-measurement, GPS
+    teleporting in old phone/Strava imports, and any duplicate current-record rows."""
     from app.services.route_matcher import compute_best_splits, STANDARD_DISTANCES
     from app.core.database import SyncSessionLocal
     from app.models.user import Activity, ActivityDataPoint, PersonalRecord
@@ -1209,6 +1221,8 @@ def recompute_personal_records_all(user_id: int):
 
         best = {}  # (sport, dist_m) -> {dur, aid, at, label}
         for a in acts:
+            if a.source_type not in PR_ELIGIBLE_SOURCE_TYPES:
+                continue  # only watch-recorded FIT files count toward PRs
             if a.sport_type == "running" and a.polyline is None:
                 continue  # indoor/treadmill — unreliable distance
             rows = db.execute(