better use of forms in bulk actions

rowers/forms.py

@@ -1265,6 +1265,12 @@ class ForceCurveMultipleCompareForm(forms.Form):
         widget=forms.CheckboxSelectMultiple()
     )
 
+bulkactions = (
+    ('remove','remove'),
+)
+class WorkoutBulkActions(forms.Form):
+    action = forms.ChoiceField(
+        choices=bulkactions, label='Action', required=True, initial='remove')
 
 class WorkoutMultipleCompareForm(forms.Form):
     workouts = forms.ModelMultipleChoiceField(