Anything that's healthy, active, and vigorous has dynamism. Your pet turtle's dynamism is really amazing — I don't think I've ever seen one move so fast!
Dynamism can be a quality of making great progress or being successful, so you might refer to the dynamism of your lemonade stand, which has been busy all afternoon and earned you fifty bucks. It also describes a positive, energetic quality in people: "Her dynamism inspired everyone around her to get involved and lend a hand." Dynamism comes from a Greek root, dynamis, "power, might, or strength."