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From Fellrnr.com, Running tips
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=Equipment=
Besides the treadmill, you'll need a camera capable of recording high speed video, sometimes referred to as "Slo-Mo video". An iPhone 6 or 7 works well, though there are other options. You'll need to place markers at regular intervals along the belt. I used round sticky labels from Amazon that are intended to be [https://www.amazon.com/gp/product/B01DE571AO color coding dots]. You need to measure the distance between the labels, and I used a standard steel rule. I put my phone on a tripod, though you could ask a friend to take the video for you instead.
[[File:Treadmill Calibration (1).jpg|center|thumb|500px250px|]]
=Setup=
{| class="wikitable" style="margin-left: auto; margin-right: auto; border: none;"
|- valign="top"
| [[File:Treadmill Calibration (2).jpg|none|thumb|500px250px|Put the markers exactly the same distance apart. I chose 12 inches, and I'd suggest something similar as you need a distance small enough that you'll travel with your foot in continuous contact, but long enough that the frame rate will cause accuracy problems.]]
|- valign="top"
| [[File:Treadmill Calibration (3).jpg|none|thumb|500px250px|The distance between your last marker and your first won't be the same as all the others, so make them visually different. I put two markers side-by-side and different colors.]]
|- valign="top"
|[[File:Treadmill Calibration (4).jpg|right|thumb|500px250px|When you're done your treadmill should look something like this. I should probably have put my markers a little further from the edge so they are easier to see when the camera's looking sideways at the treadmill from a low angle.]]
|}
=Recording=
