From Tara Glazier, at Abhaya Yoga:
Student: Why do I feel like I’m pulling my shoulder out if its socket? [in Visvamitrasana]
Tara: You might be!
This wake-up call drew a big round of laughter from the class. It’s easy to forget that the asanas are serious challenges for the body. (She went on to explain that we need to draw the shoulder strongly back into its socket to counteract the force of the leg.)