Podcast Summary: Habits and Hustle
Episode 435: Dr. Stacy Sims: Workout Like a Woman Not a "Little Man" + How To Train Based on Hormones
Release Date: March 25, 2025

Introduction

In Episode 435 of Habits and Hustle, host Jennifer Cohen engages in an enlightening conversation with Dr. Stacy Sims, an esteemed exercise physiologist and nutrition scientist. The discussion centers around how women should tailor their workouts and training regimes based on hormonal differences and unique physiological needs, especially during different life stages such as perimenopause and menopause.

1. Understanding Gender-Specific Physiology

Dr. Sims begins by highlighting the fundamental physiological differences between men and women. She emphasizes that most exercise and nutrition research has historically been male-centric, which fails to address the distinct needs of women.

• Muscle Fiber Composition:

  • Women (XX chromosomes) typically possess more slow-twitch, oxidative muscle fibers, making them naturally more endurance-oriented.
  • Men (XY chromosomes) generally have a higher proportion of fast-twitch, glycolytic fibers, suited for power and high-intensity activities.
    "[...] women's bodies are different. We have different physiology from birth. We have hormone fluctuations and these affect every system of the body."
    (02:01)

• Biomechanics and Injury Risks:
  Dr. Sims discusses how women’s biomechanics predispose them to specific injuries such as ACL tears and frozen shoulders due to quad dominance and wider shoulder girdles. She stresses the importance of strengthening the posterior chain (glutes and hamstrings) to mitigate these risks.
  "We see that when women start to do that, they reduce their injury risk and they have better posture and cutting motion."
  (08:07)

2. Training Across the Lifespan

Jennifer Cohen prompts Dr. Sims to elaborate on how training should evolve as women age, particularly through their 20s to 60s.

• Early Adulthood (20s-30s):

  • Emphasis on building a strong, resilient body through a mix of strength training and varied physical activities.
  • Incorporation of periodization in cardiovascular and strength training to adapt to hormonal changes and lifestyle stresses.
    "[...] resilience regardless of where you are in your life. And you can pepper it in your 20s and your 30s with different adventures."
    (50:53)

• Perimenopause and Menopause (40s and Beyond):

  • Shift towards high-intensity strength training to combat the loss of estrogen, which affects muscle and bone density.
  • Introduction of high-intensity interval training (HIIT) tailored to maintain lean mass and metabolic health.
    "When we lose estrogen, we're losing the impetus for strength and lean mass development."
    (02:01)

3. High-Intensity vs. Moderate-Intensity Training

A significant portion of the discussion contrasts true high-intensity training with popular moderate-intensity classes like Orange Theory and Barry's Boot Camp.

• True High-Intensity Training:

  • Involves short bursts (30 seconds or less) of maximal effort with ample recovery (2-3 minutes) to allow full intensity in subsequent intervals.
    "This is what true high intensity work is."
    (24:32)

• Issues with Moderate-Intensity Classes:

  • These classes often maintain a level of exertion that is too taxing for women in perimenopause, leading to sustained sympathetic stress and unfavorable metabolic outcomes.
    "They end up with a higher circulating amount of cortisol which becomes our new baseline."
    (21:35)

• Recommendations:

  • Dr. Sims recommends polarized training, which strictly alternates between high intensity and full recovery, avoiding the middle ground of moderate intensity.
    "Stay out of the middle zone so you can go super hard when you need to and you recover super easy."
    (27:39)

4. Nutrition and Fasting

The conversation delves into dietary strategies tailored for women, especially regarding fasting and protein intake during different hormonal phases.

• Fasting:

  • Dr. Sims advises a more conservative approach to fasting for women, suggesting a 12-hour overnight fast rather than extended fasting periods.
    "You do your 12-hour overnight fast."
    (31:08)
  • Highlights the increased sensitivity of women's hypothalamus to nutrient density, making prolonged fasting potentially disruptive to endocrine health.
    "Women are more sensitive to no calories because we're the ones responsible for reproduction."
    (35:40)

• Protein Intake:

  • Women, particularly in their 40s and beyond, require higher protein intake (1 to 1.1 grams per pound) to overcome anabolic resistance and maintain lean mass.
    "Women really need to dial it up because that recommendation that is based on the bare minimum to prevent malnutrition is still circulating as the needs for people."
    (35:54)
  • Emphasizes plant-based protein sources, advocating for a diverse intake to ensure all essential amino acids are consumed.
    "It's just about the total amount of protein you have through the day and making sure that you have all your essential amino acids."
    (37:51)

5. Supplements and Trending Health Topics

Dr. Sims provides insights into beneficial supplements and evaluates current health trends affecting women.

• Essential Supplements:

  1. Creatine Monohydrate: Supports brain, gut, and heart health.
  2. Omega-3 Fatty Acids: Enhances antioxidant capacity and cellular health.
  3. Vitamin D3: Crucial for bone health and immune function.
     "Those big three and then some protein and then we can kind of pepper other things in on an individual basis."
     (40:57)

• Peptides and Ozempic:

  • Dr. Sims is cautious about the widespread use of peptides and medications like Ozempic for non-medical purposes, stressing that their benefits should be carefully weighed against potential risks.
    "Ozempic can help with appetite control and weight loss, but it should be used judiciously and in conjunction with strength training and proper nutrition."
    (45:45)

• Saunas and Cold Plunges:

  • Advocates for the use of traditional saunas over infrared saunas for their more effective cardiovascular and metabolic benefits.
  • Advises against extreme cold plunges for women, recommending cool water instead to avoid excessive sympathetic stress.
    "Heat does so much more for a woman's body than cold plunge."
    (57:22)

6. Practical Training and Daily Habits

Jennifer Cohen seeks practical advice on implementing Dr. Sims' recommendations into daily routines.

• Training Recommendations:

  • Incorporate strength training 3-4 times a week focused on the posterior chain.
  • Include sprint or high-intensity interval sessions 2 times a week.
  • Engage in jump training to enhance bone density.
    "A day in the life for me includes getting up early, training, strength work, and prioritizing sleep."
    (52:07)

• Daily Habits:

  • Dr. Sims emphasizes the importance of morning routines, prioritizing sleep, and maintaining a balanced schedule that accommodates work, family, and personal time.
    "I need to get up before anyone else in the household so I can have 10 to 15 minutes of absolute no noise because that's how I can reset and recenter."
    (52:07)

7. Conclusion and Key Takeaways

Dr. Sims concludes with valuable advice on focusing on fundamental health practices over trendy, unverified methods.

• Underrated Health Tips:

  • Trusting personal intuition regarding sleep, nutrition, and exercise.
    "The most underrated is the intuition. [...] rating of perceived exertion without any of the tools."
    (55:59)

• Overrated Health Myths:

  • Over-reliance on biohacking trends and supplements without addressing basic health needs.
    "It's all those top end, like the 1% that you should be looking at, like peptides or fasting."
    (57:14)

• Final Thoughts:

  • Emphasizes returning to the fundamentals: mindfulness, sleep, physical activity, and nutrition.
    "Focus on those, then we can start to really see change."
    (55:59)

Notable Quotes

• "Women are not like men and they shouldn't be training like men."
  – Dr. Stacy Sims
  (00:04)

• "When we lose estrogen, we're losing the impetus for strength and lean mass development."
  – Dr. Stacy Sims
  (02:01)

• "Stay out of the middle zone so you can go super hard when you need to and you recover super easy."
  – Dr. Stacy Sims
  (27:39)

• "The most underrated is the intuition."
  – Dr. Stacy Sims
  (55:59)

Closing Remarks

Jennifer Cohen expresses her gratitude to Dr. Sims for the insightful discussion and encourages listeners to explore Dr. Sims' work further, including her books Roar and Next Level: Peri- and Postmenopausal Wellness. The episode wraps up with a brief personal anecdote from Dr. Sims about her recent athletic injury, underscoring the practical challenges faced even by experts in the field.

Additional Resources

• Dr. Stacy Sims’ Books:

  • Roar
  • Next Level: Peri- and Postmenopausal Wellness

• Follow Dr. Stacy Sims:

  • Habit Nest
  • Dr. Stacy Sims' Website

Conclusion

Episode 435 of Habits and Hustle offers a comprehensive exploration of how women can optimize their training and health practices by understanding and embracing their unique physiological and hormonal profiles. Dr. Stacy Sims provides actionable insights backed by scientific research, empowering women to achieve longevity, performance, and overall wellness tailored to their individual needs.