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Dynamic analyses are on our roadmap. We plan to include 4D data for a variety of motions. We have 4D scanning infrastructure at our faculty to capture the full 3D body during motion.
For now, it is however already possible to do motion analyses with the current DINED Mannequin. You would first need to extend the downloaded STL models with an animation skeleton, e.g. by using Mixamo. Once you have the articulating model available, then you can animate the body in software like Maya or Blender. By in that way using multiple body sizes you can get a good idea of the sizing requirements for the dynamic product. See here for a quick tutorial on making Mannequins articulating: Animating DINED Mannequins with Mixamo