Some things simply can't wait for resolutions. To clarify, we are talking about New Year's resolutions. That mythical "starting line" that occurs on January 1 each year can be recreated in any month on any day that you choose. As parents, we all want our kids to be happy and healthy so we try to put them in position to be active through a variety of programs. However, sometimes we fail to realize that while that is good, the best way to motivate our kids to be active is to give them a good example to follow.
There's no selfishness in putting a priority on your own fitness as a parent when the reality is that the healthier you are the more you are able to give to your child. Give...meaning time, interest, attention, and motivation. It's only half the equation when you encourage your child to exercise and don't keep up. Kids will do what you say because they have to, but they will do what you do because they learn to.
Notice that when airlines are giving their pre-flight safety instructions, they always say to "secure your mask first", because if you don't you simply will not be able to help the person depending on you most. Don't you think it's time to apply that same philosophy to keeping yourself active and healthy? Sounds like a great New Year's resolution right? Wrong. It sounds more like a resolution to begin no matter what day tomorrow is.
Here's an article with some more thoughts aimed at getting you moving as a busy parent!