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What does Rx mean in CrossFit?

In CrossFit, “Rx” stands for “prescribed” or “as prescribed.” It refers to the recommended or standard version of a workout, including the specified weights, repetitions, movements, and time or rounds to complete. Completing a workout “Rx” means performing it exactly as written, without any modifications or scaling. It’s often used to indicate the highest level of difficulty or intensity for a particular workout.


Modifications and scaling in CrossFit refer to adjustments made to workouts to accommodate individual fitness levels, abilities, or specific needs. Here’s a breakdown:

  1. Modifications: These are alterations to the prescribed workout that tailor it to an individual’s capabilities or limitations. Modifications may include changing movements, reducing weights or repetitions, or adjusting the intensity. For example, modifying a pull-up to a ring row for someone who is not yet able to perform pull-ups.
  2. Scaling: Scaling involves adjusting the workout to make it more manageable or challenging based on an individual’s current fitness level. Scaling can involve reducing or increasing the intensity, volume, or complexity of movements to ensure the workout is appropriately challenging for each athlete. For instance, scaling a high-intensity workout by reducing the weight or shortening the duration of the workout.

Both modifications and scaling are common practices in CrossFit to ensure that workouts are safe, effective, and accessible to participants of all fitness levels, from beginners to advanced athletes. They allow individuals to progress at their own pace and gradually build strength, endurance, and skills over time.