Commercial SEMG
On one end, there’s commercial-grade sparse electromyography or SEMG—the kind of sensors used in fitness trackers, rehab tools, and low-cost prosthetics.
These sensors are inexpensive, wearable, and run in real time. But they’re crude.
Think of them like motion alarms: they can tell you if a muscle is active. Not how intensely. Not which one precisely. And definitely not what motion the correlating musculature is conducting.