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Lumo Run is available for <jfs id="B01K22SOYE" noreferb="true"/> which is a comparable price for a 9-axis device. (Early versions of the Lumo have a fault where light causes a bad battery reading, so you have to insert it into its holder the other way round.)
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{{DISPLAYTITLE:Lumo Run Review}}
'''Update: Lumo has gone bankrupt and as far as I can see their sensors are effectively bricked. Unlike BSX, who made some of their software open source, Lumo has just disappeared. '''Lumo Run is a [[Running Sensors| Running Sensor]] that mounts on the rear waistband of your shorts. It measures a number of aspects of your [[Running Form]], including [[Cadence]], [[Vertical Oscillation]] (bounce), braking, pelvic drop, and pelvic twist. Lumo uses a 9-axis sensor, which is a 3-axis accelerometer plus a 3-axis gyroscope and a 3-axis magnetometer allowing it to sense movement far better than sensors that rely on the accelerometer alone. It's this 9-axis sensor that allows some of the potentially interesting metrics to be gathered.
* '''Cadence'''. I believe [[Cadence]] is the single most important running metric, and while Lumo seems accurate, the lack of real time data is especially annoying here.
* '''Vertical Oscillation'''. This is how much your torso moves up and down with each stride. It is generally believed that less Vertical Oscillation is a better, but I suspect that this is an oversimplification. Some are part of a runner's [[Vertical Oscillation]] is likely to be elastic in nature (consider a bouncing rubber ball), some of the vertical motion will be while the runner is airborne (ballistic), and some of the vertical motion is the deceleration as the runner lands. So, it seems likely to me that excessive vertical oscillation is bad, but it's a tricky to know what excessive is likely to be, or how to correct it.
* '''Rotation'''. As your support leg moves backwards, there is a tendency for the pelvis to twist so the supported side if further back and the side with the leading leg is further forward. Tight hip flexors make this a lot worse. Lumo recommends less than 15 degrees.
* '''Ground Contact Time (future)'''. Lumo are planning on adding this metric, along with stride length. (It's not clear why they can't calculate stride length from pace and cadence.)
=Recommendation=
I think that the Lumo has potential, but needs more development.