“Many variations of standing meditation require that the arms be held up, as if holding a ball, for fifteen minutes or more.
At first, such postures are unpleasant, and cause tension and soreness in the shoulders. However, the posture itself is not the problem, it only exposes the problem: an unhealthy lifestyle, so deficient in exercise that even your own arms seem oppressively heavy. After a few weeks of regular practice, the soreness will give way to more pleasant sensations. You will be able to raise your arms up with no discernable effort, and your entire body will become warm. Your joints will feel well-lubricated; stiffness or arthritic conditions will be relieved.
A lack of upper-body strength is not the only obstacle to successful practice. After the soreness disappears, a succession of images will parade through your mind. Endlessly replaying the events of the past, and predicting those of the future, you should begin to recognize that you are addicted to distractions. Starving the beast will weaken it. If you can disregard these distractions from within, do so; otherwise, remove them from your practice environment. Shut the windows and the doors. When your mind finally stops, your perception of time will change; instead of watching the clock, you’ll wish you had more time to spend in this calm and quiet state.”
– The Four Paradoxes of Standing Meditation. By Wang Xiangzhai, the founder of Yi Quan.