Interpersonal coordination.

<p>Top: an example of the center of mass (CoM) movement of two rowers (solid lines) and the movement of the ergometers (dashed line) during inphase (A) and antiphase rowing (B). The bars below the CoM movement indicate the duration of backward (cf. drive phase; dark grey) and forward (cf. recovery phase; light grey) CoM movement of both rowers. Bottom: continuous relative phase between the CoM movements during inphase (C) and antiphase rowing (D). The intended relative phase is displayed by the dotted lines.