Already afraid of heights, Shayna couldn't even look at the wall at first. Eventually, she got in the harness and gave it a go, putting her trust in her husband.
Watch Shayna and Dan's rock climbing experiment.
Eventually, Shayna surprised herself and conquered the wall. "It's just not as hard as I thought it would feel," she says. "It makes me really trust him, and I feel like I let go and he was there and he didn't let me fall. It was very freeing."
Dr. Berman says relinquishing control was the most important thing for Shayna. "She had to put her trust in Dan, and he didn't let her fall and she actually let go. That is huge," she says.