Virus
Virus is a physical ensemble exercise in which one player begins with a specific behavior, sound, or movement that spreads to others through proximity or contact, eventually infecting the whole group. The exercise demonstrates how energy and impulse propagate through an ensemble and trains players to notice and respond to the influence of their partners.
Structure
Setup
Participants move through the space or stand in a loose configuration. One player is secretly designated as the initial carrier, or a player simply begins the exercise by initiating a behavior.
Exercise
The carrier begins a repetitive behavior: a sound, a gesture, a movement pattern, or a combination. As other players come within proximity, the behavior begins to spread to them. Each newly infected player continues the behavior and in turn spreads it to players who have not yet been affected.
The exercise continues until all players have been infected and the group is performing the behavior together. The facilitator may then call an end or introduce a second carrier with a different behavior.
Variation
In a multi-strain variation, two carriers begin simultaneously with different behaviors. Players who come into contact with both carriers must negotiate which behavior they adopt or synthesize the two behaviors into a hybrid. The exercise then explores how competing influences interact within an ensemble.
How to Teach It
How to Explain It
"One player is secretly infected with a behavior: a phrase, a gesture, a physical tic. As the scene continues, they infect others through contact or proximity. Infected players adopt the behavior without announcing it. The scene continues as the virus spreads."
Objectives
Virus trains players to notice and respond to the subtle influence of their partners' energy and behavior. The exercise makes visible a dynamic that is usually implicit in scene work: one player's specific physical and emotional choices propagate through the ensemble and shape the collective reality of a scene. By making the propagation mechanism explicit and physical, the exercise builds sensitivity to the ensemble-level effects of individual choice.
Facilitating the Exercise
Encourage players to spread the behavior gradually, not immediately. The exercise works best when players are genuinely attending to proximity and contact rather than performing a predetermined social game. If the behavior spreads too quickly, slow the exercise by requiring sustained contact before infection occurs.
Debrief by asking players to describe what they noticed about the moment of being infected: did they resist? Did they choose to adopt the behavior or did they find themselves already doing it? The distinction between active adoption and involuntary absorption is a productive entry point into discussion of ensemble influence.
Applications
The exercise works as a warm-up or as a focused training exercise for groups working on presence and attunement. In applied settings, the propagation metaphor connects to discussions of organizational culture and how individual behavior shapes group norms.
History
John Kelley documents "The Virus" in Improv Ideas (2004), a comprehensive collection of improv exercises and scenarios for educational and workshop use. The exercise belongs to the family of contagion and propagation games found across physical theatre and drama education traditions, which use the metaphor of infection to dramatize how behavior and energy spread through groups.
No single originator is documented in published improv sources. The metaphor of viral propagation as a model for ensemble influence appears across multiple improv writers, who use the image to describe how focus, commitment, and energy spread from one player to the group.
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Related Exercises
Whoosh
Whoosh is an energetic circle exercise in which players pass a sound-and-gesture impulse around the group with the option to reverse, deflect, or redirect using different sounds and movements. The exercise is typically played as a layered game in which new moves are introduced one at a time, building complexity and requiring players to hold multiple rules simultaneously. The exercise builds group energy, quick decision-making, and the habit of sending and receiving clear physical signals.
Alliances
Alliances is a spatial awareness exercise in which each player secretly selects one person in the group as their ally and another as their enemy, then moves through the space trying to keep the ally positioned between themselves and the enemy at all times. No one announces their choices, so the resulting group movement becomes complex, organic, and unpredictable as every participant simultaneously pursues their own spatial objective. The exercise produces a constantly shifting formation that resembles flocking behavior, with sudden accelerations, direction changes, and clusters forming and dissolving. Alliances develops spatial awareness, peripheral vision, and the ability to read and respond to group movement patterns without verbal communication. It also demonstrates how simple individual rules can generate complex group behavior, a principle that applies directly to ensemble scene work.
Triangles
Triangles is a movement exercise in which each player secretly selects two other people in the space and attempts to maintain an equilateral triangle with them as all players move simultaneously. Because everyone's target pairs are different and unknown to others, the formation shifts continuously with no fixed resolution. The exercise demonstrates how invisible individual choices produce complex collective patterns, and builds sustained spatial awareness and attention to others.
Trust Exercise
Trust Exercise is an ensemble warm-up in which players practice physical vulnerability and mutual support through structured trust-fall and trust-lift configurations. One player allows their body to be caught, supported, or passed by the group, developing the physical and psychological openness that ensemble ensemble work requires. The exercise builds ensemble cohesion by making reliance on others literal and concrete.
The Wave
The Wave is a group exercise in which players send a wave of movement or energy around a circle, each person picking up and passing on the previous player's motion. The exercise trains group rhythm, physical sensitivity, and the instinct to receive and transmit energy without breaking the chain. It is accessible to players of all ages and experience levels.
Shuffle
Shuffle is a physical warm-up exercise in which players mill through the space and must quickly form groups of a called-out number when the facilitator gives the signal. Players who cannot find a complete group in time are eliminated or take a forfeit. The exercise builds physical energy, spatial awareness, and the habit of actively and immediately seeking connection with other players.
How to Reference This Page
The Improv Archive. (2026). Virus. Retrieved March 17, 2026, from https://improvarchive.org/exercises/virus
The Improv Archive. "Virus." The Improv Archive, 2026. https://improvarchive.org/exercises/virus.
The Improv Archive. "Virus." The Improv Archive, 2026, https://improvarchive.org/exercises/virus. Accessed March 17, 2026.
The Improv Archive is a systemically maintained repository. The archive itself acts as the corporate author.