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The static method WorkoutType() should return the shared HKWorkoutType object. It instead returns an object of type HKWorkout.
Apple Docs: https://developer.apple.com/library/ios/documentation/HealthKit/Reference/HKObjectType_Class/#//apple_ref/occ/clm/HKObjectType/workoutType
Xamarin Docs: https://developer.xamarin.com/api/member/HealthKit.HKObjectType.WorkoutType/
Yes, this is already fixed  by adding a correct
> HKWorkoutType GetWorkoutType ();
and obsoleting the existing
 maccore/master 313d5c65180474f3797b1cd500be01e7560faa0d
You should already have access to this API in the preview releases for tvOS/watchOS that also includes newer API (and fixes) for iOS.
I am not seeing GetWorkoutType(). I have Xamarin.iOS 184.108.40.206 and Xamarin Studio 5.10.1 (build 6) installed.
I already tried the alpha channel.
Do I need to downgrade versions to the ones from this link:
Use XI 9.5.x  from preview #4 
Just confirming I see the fix in the preview. Thank you.
*** Bug 38045 has been marked as a duplicate of this bug. ***