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Thx for the thoughts, you're right that probably the accelerometer is the best choice of course. ADXL345 has free fall detection, I am currently investigating this. The problem is that the puck is such a nice package, even a lanyard can be attached. Now the extra cables for the accelerometer will require new 3d printing for another case, etc.
hansamann
@Joakim
Couldn't there be false positives caused by a fluctuating magnetic field that the magnetometer picks up (or something like that, I'm not educated on magnetism)? It could appear as if the wearer was active, even though the person was immobile.
Also, isn't this a field many are trying to get into ("e-Health")? There could be accelerometers out there that specialise at detecting falls.