Final answer:
Training on instability devices can reduce the overall agonist force production capacity and power output of the athlete to less than 50% of what can be achieved in a stable condition.
Step-by-step explanation:
Training on instability devices can reduce the overall agonist force production capacity and power output of the athlete to less than 50% of what can be achieved in a stable condition. For example, if an athlete can generate 100 units of force or power in a stable condition, training on instability devices may reduce it to only 50 units.