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Women's Metabolic Clarity · Topic 3 of 15

Why HIIT or Cardio-Only Can Backfire

If you are working harder and getting worse results, there may be a reason. You are not lazy.

Educational disclaimer: This content is for education only. It is not medical advice, diagnosis or treatment. Pinnacle Coordinated Wellness is an education-first coordination layer, not a medical office, and Dr. Pat Pachciarz® is not a clinician. Nothing here is a protocol, dose or promise of results. Always talk with your own licensed clinician before making any health change. If you have chest pain, trouble breathing, thoughts of self-harm, or another emergency, call 911 (or call or text 988 for mental health crisis support).
On this page
  1. I do lots of cardio. Why am I still gaining?
  2. Can HIIT (high-intensity interval training) make things worse?
  3. What kind of exercise helps most in midlife?
Question 7 of 45

I do lots of cardio. Why am I still gaining?

Short answer

  • Cardio is great for your heart. But cardio alone does not do much to keep muscle.
  • As muscle fades in midlife, cardio-only plans may not protect body shape or strength.
  • Guidelines suggest a mix: heart-pumping movement AND strength work.
  • It is not that you are doing it wrong. Your body's needs may have changed.

What to look out for

  • Long cardio sessions with no strength work.
  • Feeling drained, hungry or sore for days after.
  • Weight or waist going up despite more effort.

Top 3 things to act on or ask your clinician

  1. Ask: 'Is my exercise mix right for my stage of life?'
  2. Ask: 'Could I be under-fueling or under-recovering?'
  3. Ask for help building a balanced weekly plan with a qualified pro.
Expert vs. evidence: Dr. Stacy Sims suggests women in menopause skip much moderate 'middle zone' cardio and focus on strength plus short hard intervals. U.S. guidelines (Piercy 2018) still count moderate activity as healthy and helpful. We go with the guidelines: moderate movement still counts. Talk with your clinician about the best mix for you.
Sources for this answer
  1. Peer-reviewed Piercy KL et al. The Physical Activity Guidelines for Americans. JAMA. 2018;320:2020-2028. PMID: 30418471. DOI: 10.1001/jama.2018.14854
  2. Peer-reviewed Juppi HK et al. Menopause and Body Composition: A Complex Field. Semin Reprod Med. 2025;43:85-105. PMID: 40489975. DOI: 10.1055/s-0045-1809531
  3. Peer-reviewed Isenmann E et al. It's never too late: The impact of resistance training on strength and body composition in females across the lifespan - A systematic review and meta-analysis. J Sci Med Sport. 2026;29:1174-1185. PMID: 41963141. DOI: 10.1016/j.jsams.2026.03.002
  4. Expert commentary, not research Dr. Stacy Sims (exercise physiologist): Next Level: Menopause and Beyond (book, Rodale, 2022)
  5. Expert commentary, not research Dr. Stacy Sims on Huberman Lab: Female-Specific Exercise & Nutrition for Health, Performance & Longevity (podcast episode, July 2024)
Question 8 of 45

Can HIIT (high-intensity interval training) make things worse?

Short answer

  • HIIT can be helpful. A review found HIIT can lower fat mass in women before and after menopause.
  • But hard exercise raises cortisol, a stress hormone, for a short time. That is normal.
  • If you already sleep poorly and feel stressed, doing a lot of hard workouts may leave you worn out.
  • The key word is balance. Rest is part of the plan.

What to look out for

  • Feeling wired at night after evening workouts.
  • Getting sick or hurt more often.
  • Dreading workouts or feeling more tired each week.

Top 3 things to act on or ask your clinician

  1. Ask: 'How much hard exercise is right for me right now?'
  2. Ask: 'Could poor sleep or stress be affecting my recovery?'
  3. Ask about tracking how you feel, not just calories burned.
Sources for this answer
  1. Peer-reviewed Dupuit M et al. Effect of high intensity interval training on body composition in women before and after menopause: a meta-analysis. Exp Physiol. 2020;105:1470-1490. PMID: 32613697. DOI: 10.1113/EP088654
  2. Peer-reviewed Hill EE et al. Exercise and circulating cortisol levels: the intensity threshold effect. J Endocrinol Invest. 2008;31:587-91. PMID: 18787373. DOI: 10.1007/BF03345606
  3. Peer-reviewed Baker FC et al. Sleep and Sleep Disorders in the Menopausal Transition. Sleep Med Clin. 2018;13:443-456. PMID: 30098758. DOI: 10.1016/j.jsmc.2018.04.011
  4. Expert commentary, not research Dr. Mary Claire Haver (OB/GYN): The New Menopause (book, Rodale, 2024)
  5. Expert commentary, not research Dr. Stacy Sims on Huberman Lab: Female-Specific Exercise & Nutrition for Health, Performance & Longevity (podcast episode, July 2024)
Question 9 of 45

What kind of exercise helps most in midlife?

Short answer

  • Research supports a mix: strength training, heart-healthy movement, and balance work.
  • Fitness of your heart and lungs (called VO2 max) is strongly linked to living longer.
  • Strength training helps muscle and bone. Daily walking helps blood sugar and mood.
  • The 'best' plan is the one you can safely keep doing.

What to look out for

  • Doing only one kind of exercise.
  • Big jumps in training without building up.
  • Ignoring pain or health conditions.

Top 3 things to act on or ask your clinician

  1. Ask: 'Can we check my fitness level as a health marker?'
  2. Ask: 'What should my weekly mix look like, given my health?'
  3. Ask: 'Who can coach me safely?'
Expert vs. evidence: Dr. Peter Attia stresses VO2 max as a key longevity marker. Large studies (Mandsager 2018) do link higher fitness with lower death risk. These studies show a link, not proof of cause.
Sources for this answer
  1. Peer-reviewed Piercy KL et al. The Physical Activity Guidelines for Americans. JAMA. 2018;320:2020-2028. PMID: 30418471. DOI: 10.1001/jama.2018.14854
  2. Peer-reviewed Mandsager K et al. Association of Cardiorespiratory Fitness With Long-term Mortality Among Adults Undergoing Exercise Treadmill Testing. JAMA Netw Open. 2018;1:e183605. PMID: 30646252. DOI: 10.1001/jamanetworkopen.2018.3605
  3. Peer-reviewed Watson SL et al. High-Intensity Resistance and Impact Training Improves Bone Mineral Density and Physical Function in Postmenopausal Women With Osteopenia and Osteoporosis: The LIFTMOR Randomized Controlled Trial. J Bone Miner Res. 2018;33:211-220. PMID: 28975661. DOI: 10.1002/jbmr.3284
  4. Expert commentary, not research Dr. Stacy Sims (exercise physiologist): Next Level: Menopause and Beyond (book, Rodale, 2022)
  5. Expert commentary, not research Dr. Peter Attia: Outlive: The Science and Art of Longevity (book, 2023)
Sources

Every source on this page

Peer-reviewed research comes first, then society guidance, then expert commentary. Dr. Mary Claire Haver and Dr. Stacy Sims are listed first among the experts. Expert voices are commentary, not research. When an expert claim differs from the evidence, we follow the evidence and say so.

  1. Peer-reviewed Piercy KL et al. The Physical Activity Guidelines for Americans. JAMA. 2018;320:2020-2028. PMID: 30418471. DOI: 10.1001/jama.2018.14854
  2. Peer-reviewed Juppi HK et al. Menopause and Body Composition: A Complex Field. Semin Reprod Med. 2025;43:85-105. PMID: 40489975. DOI: 10.1055/s-0045-1809531
  3. Peer-reviewed Isenmann E et al. It's never too late: The impact of resistance training on strength and body composition in females across the lifespan - A systematic review and meta-analysis. J Sci Med Sport. 2026;29:1174-1185. PMID: 41963141. DOI: 10.1016/j.jsams.2026.03.002
  4. Peer-reviewed Dupuit M et al. Effect of high intensity interval training on body composition in women before and after menopause: a meta-analysis. Exp Physiol. 2020;105:1470-1490. PMID: 32613697. DOI: 10.1113/EP088654
  5. Peer-reviewed Hill EE et al. Exercise and circulating cortisol levels: the intensity threshold effect. J Endocrinol Invest. 2008;31:587-91. PMID: 18787373. DOI: 10.1007/BF03345606
  6. Peer-reviewed Baker FC et al. Sleep and Sleep Disorders in the Menopausal Transition. Sleep Med Clin. 2018;13:443-456. PMID: 30098758. DOI: 10.1016/j.jsmc.2018.04.011
  7. Peer-reviewed Mandsager K et al. Association of Cardiorespiratory Fitness With Long-term Mortality Among Adults Undergoing Exercise Treadmill Testing. JAMA Netw Open. 2018;1:e183605. PMID: 30646252. DOI: 10.1001/jamanetworkopen.2018.3605
  8. Peer-reviewed Watson SL et al. High-Intensity Resistance and Impact Training Improves Bone Mineral Density and Physical Function in Postmenopausal Women With Osteopenia and Osteoporosis: The LIFTMOR Randomized Controlled Trial. J Bone Miner Res. 2018;33:211-220. PMID: 28975661. DOI: 10.1002/jbmr.3284
  9. Expert commentary, not research Dr. Mary Claire Haver (OB/GYN): The New Menopause (book, Rodale, 2024)
  10. Expert commentary, not research Dr. Stacy Sims (exercise physiologist): Next Level: Menopause and Beyond (book, Rodale, 2022)
  11. Expert commentary, not research Dr. Stacy Sims on Huberman Lab: Female-Specific Exercise & Nutrition for Health, Performance & Longevity (podcast episode, July 2024)
  12. Expert commentary, not research Dr. Peter Attia: Outlive: The Science and Art of Longevity (book, 2023)
Your next step

Take this to your clinician.

  • Bring your questions and a short symptom log to your next appointment.
  • Want help organizing your questions and care team? Pinnacle Coordinated Wellness is here to listen and connect.
  • Practitioners: share this page with the women you serve.
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All 15 topics · Other topics: Weight and Body Changes · Muscle and Strength · Insulin Resistance and Blood Sugar · Sleep and Night Sweats · Cortisol and Stress · Brain Fog, Mood and Anxiety · Thyroid · Bloodwork: What to Ask For · Heart and Bone Risk After Menopause · Hormone Therapy Basics · Gut Health · Nutrition and Protein · Alcohol · The Shame and Guilt Cycle, and Identity