A good friend of mine introduced me to paida & lajin by Master Xiao Hongchi in 2011. I did not take any action then.
This May, I watched Master Xiao’s UPS video and his interview at Beyond 2012 conference by chance. Intrigued by his demonstration and explanation, I started to practice lajin on a piano bench by the door. I did lajin three times a day: early morning, noon, and late evening. Each time lasted 20 minutes: 10 min per leg. In 3 short weeks, I was pleasantly surprised by its effect on my right foot.
For past 10 years, one area of my right foot had extremely dry skin. It itched and cracked often, was not cured by any lotion, gel, or medicine. However, a few weeks of lajin made significant improvement on it (see 3 pictures here).
A second benefit is that the quality of my sleep has improved: fewer dreams and less waking up.