Fitness and weight tracking can help stop obesity, but for people with disabilities, they often don’t work at all.

Sebastian Williams is 20 pounds away from a brand-new life. A 64 year-old disabled veteran in Austin, Texas, Williams has spinal stenosis—a condition that causes him pain in his neck and lower back—and osteoarthritis in his hips. Together, the two conditions cause Williams extreme daily pain, sometimes confining him to bed for entire days and making it tough to walk even short distances across his home.

“When you move, it feels like somebody’s got a knife inside your hip,” he says. “Every time you move your hip, it’s like something cutting you.”