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NASM Certified Personal Trainer · Program Design

NASM Certified Personal Trainer: Acute Variables and Progression Concepts

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Overview

This chapter covers the training choices a trainer controls in each session and the rules that explain how the body gets fitter. These choices are called acute variables. The exam asks you to name them and to match a training principle to its meaning.

Acute variables include reps, sets, intensity, tempo, rest, and exercise selection. Intensity means how hard the exercise is, such as the weight lifted. Changing any one of these changes the result of the program.

Progressive overload means slowly raising the demands of training over time so the body keeps adapting. The SAID principle says the body adapts to the specific demands placed on it, so training should match the goal.

The general adaptation syndrome describes how the body handles stress in three stages. The alarm reaction is the first response to a new stress. Resistance development is when the body adapts. Exhaustion happens when stress is too much for too long, which can lead to injury or overtraining.

Key concepts

  • Acute variables

    The details a trainer sets for each workout: reps, sets, intensity, tempo, rest, and exercise selection. They decide what the workout will develop.

    Memory tipThink of them as the knobs on a training machine you can turn.

  • Intensity

    How hard an exercise is. In resistance training, it is usually the amount of weight lifted compared with the most the person can lift.

    Memory tipIntensity = how heavy or how hard, not how many.

  • Progressive overload

    Gradually increasing training demands over time, such as more weight, more reps, or harder exercises, so the body keeps improving.

    Memory tipA little more, a little at a time.

  • SAID principle

    Specific Adaptation to Imposed Demands. The body gets better at exactly what it practices, so training should match the client's goal.

    Memory tipSAID: you get what you train for.

  • General adaptation syndrome

    A model of how the body reacts to stress in three stages: alarm reaction, resistance development, and exhaustion.

    Memory tipA-R-E: Alarm, Resistance, Exhaustion. 'Are you overdoing it?'

Often tested

  • Tempo, rest, and exercise selection count as acute variables, not just reps and sets.
  • Alarm reaction is the first response; resistance development is where adaptation happens.
  • The exhaustion stage comes from too much stress for too long.
  • SAID means matching training to the specific goal.

Easy to confuse: Stages of the general adaptation syndrome

StageWhat happens
Alarm reactionFirst response to a new stress, such as soreness
Resistance developmentThe body adapts and gets better at the task
ExhaustionStress is too much for too long; injury or overtraining risk

3 sample questions

Verified practice questions from this unit.

Practice questionReviewedProgram Design › Acute Variables and Progression★★★★☆

Question 1. What does progressive overload mean?

  1. ① Doing the same workout every session
  2. ② Gradually increasing the demands of training over time
  3. ③ Using very long rests every set
  4. ④ Lifting the heaviest weight in the first session
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Answer: ② Gradually increasing the demands of training over time

Key point: Progressive overload = gradually raise demands

To keep improving, the demands of training must rise slowly over time, for example more weight, reps, or sets.

Wrong choices

  • Doing the same workout every session: The body stops adapting without change.
  • Using very long rests every set: Rest alone does not increase the demand.
  • Lifting the heaviest weight in the first session: The load should rise gradually.
Practice questionReviewedProgram Design › Acute Variables and Progression★★★★☆

Question 2. Which of these is an acute variable of program design?

  1. ① Resting heart rate
  2. ② Tempo
  3. ③ Client's age
  4. ④ Body weight
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Answer: ② Tempo

Key point: Acute variables: reps, sets, intensity, tempo, rest

Acute variables are the training choices a trainer can change, such as reps, sets, intensity, tempo, rest, and exercise selection.

Wrong choices

  • Resting heart rate: This is an assessment measure, not a program variable.
  • Client's age: This is client information, not a variable.
  • Body weight: This is an assessment measure, not a variable.
Practice questionReviewedProgram Design › Acute Variables and Progression★★★★☆

Question 3. Which acute variable describes how hard an exercise is, such as the weight lifted?

  1. ① Tempo
  2. ② Rest interval
  3. ③ Exercise selection
  4. ④ Intensity
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Answer: ④ Intensity

Key point: Intensity = how hard

Intensity is the effort or load of an exercise, such as the amount of weight.

Wrong choices

  • Tempo: Tempo is the speed of each repetition.
  • Rest interval: Rest interval is the time between sets.
  • Exercise selection: Exercise selection is which exercises are chosen.
Practice 5 questions from this unit →