Hello I just created a tech that actually worked for me. how it works is that when I blow on my arms I feel my breath is incredibly warm. Here is how it goes.
1. Breathe like this, inhale from your nose, and exhale from the mouth.
Do this several times.
2. Close your eyes (while doing the breathing tech) and and imagine the Sun. Feel the heat that it gives you.
3. Continue doing all the steps for at least 2-3 minutes.
Now breathe on your hands. Is your breath warm? If it is no warm try to concentrate harder.