We all get tired and we all have lots of responsibilities, yet we all need to exercise our bodies. When you are tired and not feeling like you can make it through a whole workout. Don't. Do something but don't do the whole thing. Try doing the first half or the last half of your workout. If you just feel like stretching, do that. But don't skip it all together. If you pick one thing to do you will keep moving in the right direction and feel better about yourself at the same time. Don't be hard on yourself, just do something and feel better. That's what life long fitness and good living is all about.