Garmin Fenix (probably the most popular running watch for ultrarunners) weighs 70-96G depending on model.Apple Watch Ultra weighs 61.3 grams. That's almost twice as much as the aluminum Series 7 & 8. I don't understand why they are saying it's for runners. That's too heavy. It looks like Apple also discontinued the Nike+ version. They only offer the bands now as a separate purchase.