Twenty minutes. That is often the window before the lower back starts to lock up — the familiar grip of it, the posture shift, the repositioning. And then there is an hour-long call that cannot wait.
Desk work does not cause back pain. But it turns manageable pain into a daily management problem. The pain becomes environmental: tied to chairs, screens, commutes, and the particular difficulty of sitting in a meeting room for three hours.
Most things people try address the structure — a better chair, a standing desk, physio exercises. These help. But the pain signal itself — the nerve pathway firing regardless of posture — is a separate problem. That is what TENS targets.
Arca is worn directly on the lower back or neck. It runs quietly under a shirt. You can wear it through a call, on a commute, at your desk. It does not require you to stop. That is the point.