Might be a good time to switch up your workout. Usually when its fun and new, exercising can be exciting, but when it becomes the same routine day after day it can become more of a chore. I'm not sure what your routine is, but if you are someone who does cardio- maybe switch up from the current machine(s) you are using to another one (i.e. use bike or eliptical instead of a treadmill). Or if you are strength training- find different exercises for your muscle groups or do different combinations of muscle groups than you were doing previously. Switching things up can make exercising more exciting and will give you something to look forward to as opposed to dreading.