Today the Full-Body version of Tornuffalo is accessible through the Steam DLC interface. It's free to owners of Tornuffalo.

http://store.steampowered.com/app/622110/
(The Steam page for the DLC also has a video about attaching a Tracker to your shoe.)

After downloading Tornuffalo and the full-body DLC, choose whether you want to play the game normally or with Vive Trackers when you launch the game.

It's designed for 3 Vive Trackers. You can play it with just 2 but it wasn't optimized for that, so the body effect isn't as good. (Keep in mind that "Vive Trackers" are different than controllers, so you need at minimum a headset and two controllers and two feet trackers to play the full-body version.)

The gameplay of the full-body version is different than the regular version. In the full-body version you get to use both of your hands and feet to kick and hit stuff. In the regular version of Tornuffalo, you only use one hand.

I recommend that beginners play the "Big Hammer" bonus mode first.