excluding strava from analysis

rowers/dataprep.py

@@ -217,6 +217,9 @@ def workout_goldmedalstandard(workout, reset=False):
 
 def check_marker(workout):
     r = workout.user
+    if workout.workoutsource == 'strava':
+        return None
+    
     gmstandard, gmseconds = workout_goldmedalstandard(workout)
     if gmseconds < 60:
         return None