In the CRE interval training example, what was the interval pattern used and how many repetitions were performed?

In the CRE interval training example, what was the interval pattern used and how many repetitions were performed?

• A. 20 seconds slow jogging followed by 10 seconds sprint, repeated 40 times
• B. 30 seconds slow jogging followed by 15 seconds sprint, repeated 20 times
• C. 60 seconds run followed by 60 seconds rest, repeated 20 times
• D. 10 seconds sprint followed by 20 seconds jog, repeated 50 times

Answer: (A)

In CRE interval training the aim is to stack short, high-intensity efforts with brief recoveries so the body spends a lot of time working hard, which builds cardiovascular and respiratory endurance over many repetitions. The interval pattern used is 20 seconds of slow jogging followed by 10 seconds of sprint, repeated 40 times. This structure keeps the workout demanding yet sustainable across many rounds, so you accrue substantial high‑intensity time without long rests. Doing 40 repetitions of a 30‑second cycle totals about 20 minutes of interval work, which is a common volume for this style of training. This pattern best fits the CRE example because it emphasizes frequent, quick, powerful efforts with short recoveries, maximizing time spent near high intensity. The other options would change the stimulus: longer work periods or rests would alter fatigue and energy systems targeted, and different repetition counts would change total volume and pacing in ways not aligned with the CRE example provided.

In CRE interval training the aim is to stack short, high-intensity efforts with brief recoveries so the body spends a lot of time working hard, which builds cardiovascular and respiratory endurance over many repetitions.

The interval pattern used is 20 seconds of slow jogging followed by 10 seconds of sprint, repeated 40 times. This structure keeps the workout demanding yet sustainable across many rounds, so you accrue substantial high‑intensity time without long rests. Doing 40 repetitions of a 30‑second cycle totals about 20 minutes of interval work, which is a common volume for this style of training.

This pattern best fits the CRE example because it emphasizes frequent, quick, powerful efforts with short recoveries, maximizing time spent near high intensity. The other options would change the stimulus: longer work periods or rests would alter fatigue and energy systems targeted, and different repetition counts would change total volume and pacing in ways not aligned with the CRE example provided.