Chi feels different to everyone, because everyone percieves it differently. General sensations have been warmth, feeling increased blood flow, as well as twitching and tingling.
Stand with your spine straight and relax. Now swing your arms up and down and breathe slowly in and out of the nose. Inhale, move arms up. Exhale move arms down. (Remember to stay RELAXED). Do this for about 30-50 repeittions or so, then stop, close your eyes and observe what you feel inside your body. Observe your hands, feet, abdominal region, and your head.
Hope this helps,