For a long time, rest was considered the best treatment for back pain. But science has shown the opposite: inactivity can actually make things worse. The real therapy is movement. Activities that work the muscles evenly — like swimming, dancing, cycling, or Nordic walking — are especially effective. But In Good Shape also explores surprising alternatives, including bouldering, barre, and reformer Pilates. How effective are these trending workouts — and where do their limits lie?