Once you have made exercise a part of your life, it seems like it should be easy to keep going. After weeks, months, or even years of doing the same routine, however, we may begin to get bored. Our bodies adapt, so we may no longer feel the same rush of endorphins on a run or notice the same changes in our body with our lifting routine. To keep your body challenged, your motivation high, and your workouts fun, think about switching things up a bit. 1. Bring a friend. Inste