With one kid dumping over the Cheerios, one kid screaming in the dining room, and whatever else you have going on, who has time for themselves?  Sometimes, I find it difficult to even find a minute to break away for my morning shower, and you can forget about make up and a blow dry.
Over my limited experience, I have found that maximizing my free time, may be the only way I can try to continue a healthy lifestyle for myself.  For instance, when the baby goes down for naps, I can choose to either add an extra hour of sleep for myself, or I can use the spare time to catch up on some exercising.  Remember that every little bit counts, and your efforts will all bring you closer to your goal.
Maximizing your free time, not only means using it wisely, but being smart about where and how you place it.  When my husband is home in the mornings, I find that a good time to ask him to watch the kids for an hour or so, and get a morning jog and a shower in.  Utilize your resources, including friends, older children, and your husband.  They all can help you as you strive to be the best mother that you can be.
Remember that this will not only benefit yourself, but it will also benefit others.  You will have more energy, and be a happier person, and who wouldn’t want that?