I enjoyed reading this post because I have experienced the change in attitude towards cold myself. It was a friend of mine who introduced me to this topic and the new knowledge completely changed the "MEANING" of cold for me. The term "meaning" is very important here and I have used this little mind "trick" when I want to dedicate to something. I would recommend reading William James's books on truth and meaning. It will open your mind on how we related to these two terms. Once I dived into the topic of cold, the meaning of cold changed for me. If the meaning changes, the experiences changes too. The previously unpleasant experience of staying in the cold, became pleasant, because it had a different meaning/utility. You don't believe me? Think of something that is painful and unpleasant to others, but you do it effortlessly. This is because it has a different meaning for you, than it does for them. Read on the benefits cold brings to the body and then when you do what the writer of this article suggests, you will have a different view on why you are doing what you are doing. This is how things get easy to do. They have a stronger meaning for you. Start with little steps. Leave the house little underdressed and experience some cold. When the mild unpleasant feeling hits you, you will ask yourself "Why am I doing this?! ". Well, if you have read on how cold is beneficial for you, you will have a good answer. If you have a good answer, guess what? You will feel less cold. Trust me. This has worked for me and not just for my relationship to cold.
Play a bit with this idea.