Interpersonal coordination is an important skill for promoting collective behavior in team sports. This study tested the impact of two types of tools in facilitating triadic coordination. 16 males aged under 12 years were divided into four groups with similar skill levels and average ages. Each group performed a three-versus-one ball passing task under three conditions: a one-elastic-band tool linking the three players, a three-elastic-bands tool linking the three players, and without a tool linking the three players. The dependent variables were ball passing frequency, frequency and amplitude of inner angles of the triangle formed by the players, and duration of the synchronized patterns of the inner angles. The results show that neither tool increased ball-passing frequency or the duration of synchronized patterns. However, both tools increased the frequency of inner angles, and the three-elastic-bands tool decreased the amplitude of inner angles. From these results, we conclude that elastic-band tools affect spatial and temporal triadic formation by means of haptic and visual information. Specifically, compared with the one-elastic-band tool, the three-elastic-bands tool stabilizes the triadic spatial formation. We also explore the implications for how these tools can be used in practice.

• We tested the two types of tools, a three-elastic-band tool and a one-elastic-band tool, both of which linked the three players together.

• Both elastic-band tools tend to facilitate temporal organization of triadic coordination.

• The three-elastic-bands tool tends to adjust the spatial formation to a stable equilateral triangle.

• Tools that physically couple the players manipulate interpersonal degrees of freedom; the three-elastic-band tool allows fewer interpersonal degrees of freedom than the one-elastic-band tool.