premise: We climbed to the East Peak of Mt. Tam and back from SF on this fine Labor Day afternoon ( about 50mi ) . I did n't think I was able to do it ( it 's a 2.4 kft hill ) , but we did it anyway . I do n't know about the others but I had to push myself ( although it might not look it ! Why do you think you were able to do the hike despite being unsure you would be able to ?
hypothesis: The hike was not difficult so it was easy to do