The most important step in putting is getting your shot on the green. The second? Your tempo. The TaylorMade Spider Interactive Putter uses Blast's 3D sensor technology to measure the time of your backstroke, forward stroke, and the ratio between the two. Using tons of tour-proven data, they know it should be 0.6, 0.3, and 2:1, respectively, regardless of how far from or close to the hole you are. The companion app helps you to adjust your stroke to match and provides a host of other metrics to help you once you've got your timing down.