NETANYA, Israel—Avi's first surf therapy session did not begin with a wave. It began with a question: How does the sea make you feel?Then the 22-year-old and the others went into the water, climbed onto their boards and tried to stand. They fell, went back out and tried again."From the very first session, I felt that I really, really wanted to succeed at this," Avi told JNS. "I knew that I probably wouldn't do very well the first few times, but …