Will it hurt? I'm afraid of pain, and my back already aches.

Our motto is not to wear you out but to make you better, so we never work through pain. The rule from the very first minute: if you feel pain or tightness, tell the trainer right away - we stop and relax, we don't force anything. The load comes on gently, millimeter by millimeter, under your own body weight rather than in jerks. There's often a pleasant feeling of the muscles waking up, and a light, healthy crack in the back - that's not pain, it's release, and over time it fades on its own.