How Busy Moms Can Build Strength and Cardio Fitness | Abbie Smith-Ryan, Ph.D.

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Peter Attia MD Jan 07, 2026

Audio Brief

Show transcript
This episode outlines a practical framework for an effective exercise routine using only three hours per week. There are three key takeaways from this discussion: how to structure a limited weekly plan, the efficacy of efficient high-intensity interval training, and the best way to gauge effort during short bursts. For individuals with only three hours weekly, an optimal plan includes two 30-minute full-body resistance sessions. Complement this with two 20 to 30-minute high-intensity interval training sessions, allocating any remaining time to low-intensity movement. Maximize cardiovascular benefits in minimal time with an efficient high-intensity interval training protocol. A one-minute on, one-minute off structure for six to ten rounds provides significant benefit, completing a full workout in under 30 minutes. During short, high-intensity intervals, prioritize Rate of Perceived Exertion over heart rate monitoring. Heart rate response often lags, making RPE a more practical and immediate indicator for ensuring maximal effort. This structure enables significant fitness gains even with severe time constraints.

Episode Overview

  • This episode provides a practical framework for structuring an effective exercise routine with only three hours per week.
  • It emphasizes prioritizing both progressive resistance training and endurance work, even with limited time.
  • The discussion breaks down specific, time-efficient protocols for both strength training and high-intensity interval training (HIIT).
  • The speakers address the practical challenges of measuring intensity for short intervals, comparing physiological metrics like heart rate to Rate of Perceived Exertion (RPE).

Key Concepts

  • Time-Efficient Training: The central theme is creating a balanced and effective fitness plan for individuals with severe time constraints (e.g., 3 hours per week).
  • Prioritizing Resistance Training: For general health and goals like those of a mid-life woman, progressive resistance training is a crucial component that should be prioritized. A full-body routine performed twice a week is recommended.
  • High-Intensity Interval Training (HIIT): HIIT is presented as a time-efficient method for improving cardiovascular fitness. A specific protocol of 1-minute on, 1-minute off intervals is discussed as highly effective.
  • Balancing Intensity: The ideal weekly plan includes a mix of modalities: two days of resistance training, one to two days of high-intensity cardio, and one day of low-intensity movement or active recovery.
  • Intensity Metrics (RPE vs. Heart Rate): For short, high-intensity intervals, relying on Rate of Perceived Exertion (RPE) can be more practical than heart rate monitoring due to the natural lag in heart rate response.

Quotes

  • At 00:25 - "I'm going to carve out three hours a week in total for training... that's going to be my resistance training, that's going to be my endurance training." - Peter Attia setting up the common real-world scenario of a person with very limited time for exercise.
  • At 01:39 - "We've done a protocol... where it's 30 minutes, it's six to eight reps... 30 seconds in between each exercise, two minutes in between, it's 30 minutes we're done." - Abbie Smith-Ryan describing a highly efficient protocol for a full-body resistance workout.
  • At 03:33 - "My issue with heart rate training when it comes to anything that's that short is the heart never gets to max heart rate until the very end." - Peter Attia explaining the practical limitation of using heart rate monitors to guide intensity during short HIIT intervals.

Takeaways

  • The 3-Hour Weekly Plan: If you only have three hours a week, a highly effective split is two 30-minute full-body resistance training sessions, two 20-30 minute high-intensity interval sessions, and one longer, low-intensity session with the remaining time.
  • Embrace Efficient HIIT: To maximize cardio benefits in minimal time, use a 1-minute on, 1-minute off interval structure for 6-10 rounds. This entire workout, including warm-up and cool-down, can be completed in under 30 minutes.
  • Train by Feel for High Intensity: For short intervals, gauge your effort by feel (RPE) instead of strictly following a heart rate monitor. Push hard enough during the "on" minute that you feel you truly need the "off" minute to recover.