Geriatric Fitness — all lessons

Age-related conditions, multimorbidity and frailty

Common age-related conditions, multimorbidity, the frailty phenotype and how exercise prevents and treats frailty.

Intermediate Evidence: Strong evidence 3 min read Reviewed 2026-10-31 Status: draft

Learning objectives

  • Define multimorbidity and frailty
  • Apply the Fried frailty phenotype
  • Explain the role of exercise in frailty
  • Plan around multiple conditions

Before this lesson

Why this matters

Frailty predicts falls, hospitalisation and loss of independence — but it can be prevented and improved.

Multimorbidity

Many older adults live with several conditions (e.g., hypertension, diabetes, osteoarthritis), each with medications and precautions.

Frailty phenotype [fried2001]

CriterionExample measure
Unintentional weight loss~4.5 kg+ in past year
ExhaustionSelf-report
WeaknessLow grip strength
Slow walkingSlow gait speed
Low activityLow energy expenditure

3+ = frail; 1–2 = pre-frail.

Exercise

Multicomponent exercise with progressive resistance, balance and aerobic work [izquierdo2021] [chodzko2009].

Common mistakes and misconceptions

Case study

An 83-year-old meets three frailty criteria. A supervised programme twice weekly for 16 weeks improves grip, gait speed and energy; she now meets only one criterion.

Further learning: video lessons

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Knowledge check

Knowledge check · 0/5

1. Frailty (Fried) requires how many criteria?

Answer C. 1–2 = pre-frail.

2. A Fried criterion is…

Answer B. Phenotype.

3. Multimorbidity means…

Answer B. Common.

4. The ICFSR recommends for frailty…

Answer B. Izquierdo et al. (2021).

5. Frailty is…

Answer B. Responds to intervention.

Short-answer & application questions

  1. Screen a fictional client using the Fried criteria.
  2. Plan exercise for a client with three conditions.
  3. Explain frailty to family members.

Key takeaways

  • Multimorbidity — two or more chronic conditions — is common in older adults.
  • The Fried phenotype defines frailty as 3+ of: weight loss, exhaustion, weakness, slow walking and low activity.
  • Multicomponent exercise, especially resistance training, is central to preventing and treating frailty.
  • Plan around the most limiting condition while targeting overall function.

Connected topics

References

  1. Fried LP, Tangen CM, Walston J, et al. (2001). Frailty in older adults: evidence for a phenotype. Journals of Gerontology Series A, 56(3):M146–M156. Cohort check pending
  2. Izquierdo M, Merchant RA, Morley JE, et al. (2021). International exercise recommendations in older adults (ICFSR): expert consensus guidelines. Journal of Nutrition, Health & Aging, 25(7):824–853. Guideline check pending
  3. Chodzko-Zajko WJ, Proctor DN, Fiatarone Singh MA, et al. (2009). American College of Sports Medicine position stand: exercise and physical activity for older adults. Medicine & Science in Sports & Exercise, 41(7):1510–1530. Position stand check pending

Educational content only — not medical advice. Consult a qualified clinician for diagnosis or treatment.