Rivalry—when a character is pitted against others who want the same thing—creates psychological strain because the outcome is uncertain. While competition is frequently associated with athletics, it can manifest at work and school (vying for a promotion or academic award), in relationships (competing for a love interest's attention or a parent's approval), and anywhere else a position of power or object of desire can be won. Regardless of the context, the character's response to this amplifier will vary depending on how prepared they are and whether they anticipate success or failure.

Sizing up the competition
Pursing the lips
Holding the gaze of their opponent
Giving their competition a nod
The character's brows lowering in concentration
Straightening their posture and thrusting out the chest
The character looking down, mentally preparing for the task ahead
Rolling the neck from side to side
Fidgety movements
Shaking out the arms and loosening up the shoulders
Bouncing in place or pacing
Behaving assertively and with confidence (even if the character is faking it)
Scanning their environment
Focusing on preparations, studying, self-improvement, or whatever else they need to do to come out on top
Setting steppingstone goals that will get them closer to success
Incessantly practicing skills the character will need to win
Learning from mistakes to avoid making them again
Being disciplined in preparing for the task ahead
Staying up late; sacrificing sleep
Pushing themselves to greater limits than ever before
Taking risks if doing so will give them an edge
Analyzing data to predict success, ascertain growth, and identify weaknesses