Whatever sport you choose, do it because you love it, and don't expect to be an expert first thing. It takes time to do well at anything, but if you love it, you'll stick with it.
I've always believed fitness is an entry point to help you build that happier, healthier life. When your health is strong, you're capable of taking risks. You'll feel more confident to ask for the promotion. You'll have more energy to be a better mom. You'll feel more deserving of love.