Two ways to implement a bead-spring polymer with confined dynamics. In the conventional variant shown in panel A the beads are connected by springs which are hooked up at their respective centers, and the bending angle between subsequent springs is confined harmonically by either a direct angle term or, as shown here, by additional springs between the next neighbours. "Brownmove" also allows to set up "bead train" polymers of rotating beads where the "front" of one bead is connected to the "back" of the previous bead with a short spring and the steric repulsion between the beads constricts the polymer dynamics. This is shown in panel B. For the simulations reported here the conventional setup A was used.