Imagine reading your favorite book or watching your favorite TV show over and over again and for days on end.After a few weeks, the entertainment value would vanish, and you’d start to dread what was once a gratifying activity, yet that’s what many of us do with our running. Most runners log nearly all of their runs at the same general distance and intensity, usually around 60 to 70 percent of their max effort. Doing the same workout day in day out is a recipe for boredom and plateaus.