Daily Archives: February 4, 2012

DIY Virtual Reality Treadmill: Leadville 100 Powerlines Climb

In one form or another, I’ve had this idea rattling around my noggin for several years.  Take GPS data from a run and follow along in Google Earth as you run on a treadmill.  This is not a unique thought, there are many indoor devices that will do similar things.  CompuTrainer and Tacx make bike trainers that adjust the resistance while you follow a route on a computer screen, and Nordic Track makes a treadmill that automatically adjusts the incline as you go along.  Very cool stuff, and I would love to have any of them.  Trouble is, they will set you back anywhere from $1,000 to $2,000.  That’s where the DIY part comes in.

I thought that I could come up with something similar for FREE, assuming you already have access to a treadmill.  The other aspect I like is that this is based on a real run.  The data came from the 2010 Leadville annual group night run.  We started at Fish Hatchery (mile 77 of the race course) and ran the final 23 miles to the finish.

For this task, I took the data from the start at FH and clipped it off a little over 5 miles later at the top of the Powerlines climb.

Why Powerlines?  Why not use the more dramatic Hope Pass for this instead?

There are so many iconic climbs to choose from.  Most of them get their reputations because they are long and steep.  To simulate Hope Pass, you can just max out the incline on your treadmill and go.  That’s all there is to it.  Powerlines was well suited to the DIY VR concept because it has a lot of variety.  There are several downs mixed in with the ups, and the grades vary from mild to very steep keeping things mixed up very nicely and make for a more engaging experience.

Using SportTracks, which has the ability to create splits after the fact, I was able to zero in on the individual high points of the route.  Then I calculated the average gradient for each section, along with the average speed.

Then I took that data and did many test runs with paper printouts that would prompt me when to change speed and incline.  I kept a pen handy as there were several small tweaks to be made in order to smooth things out a little and make it all flow better.

That was followed by more number crunching in Excel.  Toying with universally faster paces to see how it all felt.

In total, I worked on and off for two months to get things dialed in.  With the help of some GPS track playback software, I recorded the base footage along with an elevation graph that fills in as you go.

The basic idea being to crank up some of your favorite tunes, start the YouTube playback, and hop on the treadmill to follow along.  It will prompt you along the way to change incline and speed.

I had a little fun with the speed graphic.  Ketchup represents the actual speed recorded on that run back in 2010.  Then the various Taco Bell hot sauce packs (mild, hot, fire) represent 10%, 20%, and 30% increases.  That way, you can pick a level and stick with it for the duration.

I took care to arrange the speed and incline prompts in the optimal order.  I quickly learned that it wasn’t fun to ramp the speed up while you were still climbing at 15%.  Better to drop the incline, then speed up.  When you are going over the top of the false summits, it almost feels like you are really going downhill.

Even though there are grades as high as 22%, I chose to cap this at 15%.  That is as high as my treadmill will go.  If yours will only do 10% or 12%, just hit that when you see the 15.

You can always speed up or slow down if you don’t like one of the preset options.  If you stick with the incline changes, just track your ending mileage to see improvement and work to run a little faster (which doesn’t speed up the video, but will result in going further on the treadmill) over time.

The scale at the bottom of the elevation profile represents kilometers.

Now that the Front Range of Colorado is buried under a few feet of snow, it seemed like the perfect time to finish this up and get it out there.  I hope you find it enjoyable and I’ll see you in Leadville this summer!

Disclaimer:  The real climb is a LOT more difficult than running on some treadmill…

Have fun!