Even though you've directed the blessing to someone or something else, you benefit physically. It's easy to demonstrate this with muscle testing. You will find that the arm comes down easier this time, often dramatically so. Do the same test again with the person giving a compliment to someone this time and you will find that the arm has grown stronger, often much so, because the subconscious has also taken the compliment personally, has relaxed and freed up more energy to resist with. Basically, criticisms of yourself or others cause your body to tense, and compliments to yourself or others cause your body to relax.
Curses cause stress, blessings reduce it.
Using blessings alone can improve your health tremendously, and sometimes that's all that's needed. In a recent workshop a woman asked me what to do when someone else criticizes you. As we demonstrated, the most efficient and effective thing to do is to immediately contradict them aloud or silently, with a self compliment. You can bless your way to success in health. So many people have problems with their relationships, and yet a very easy and workable solution is available.