Women’s Health — all lessons

First trimester: strengthening and stretching

Exercise in the first trimester (weeks 1–13) — managing fatigue and nausea, continuing training, strength and mobility priorities.

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

Learning objectives

  • Describe common changes in the first trimester
  • Select and modify strengthening exercises
  • Apply safe stretching and mobility
  • Recognise warning signs

Before this lesson

Why this matters

Each stage of pregnancy brings different symptoms and needs. Tailoring sessions keeps exercise comfortable and safe.

What changes

Weeks 1–13: fatigue, nausea, breast tenderness; physical changes are small.

Priorities

  • Continue usual training at moderate intensity if comfortable
  • Adjust timing for nausea and fatigue
  • Begin pelvic floor training
  • Build strength foundations (squats, hinges, rows, presses)

Moderate exercise has not been shown to increase miscarriage risk in uncomplicated pregnancies [mottola2018]. Daily pelvic floor training helps prevent incontinence [woodley2020].

Example session (45 min)

BlockExercises
Warm-upWalking or cycling 8 min; mobility
StrengthGoblet squat to box, hip hinge (dumbbell RDL), seated row, incline press, side-lying clams
Pelvic floorContractions and full relaxation with breathing
Cool-downGentle stretches within comfortable range

Intensity: RPE ~12–14/20, talk test [acog2020].

Common mistakes and misconceptions

Case study

A client in the first trimester trains three times weekly with the session above, adjusting loads to comfort. She remains active and confident through this stage.

Further learning: video lessons

Video links are only marked “verified” after a human has watched them. Unverified entries open a YouTube search for that channel and topic rather than a guessed link.

Knowledge check

Knowledge check · 0/5

1. The first trimester spans roughly…

Answer A. First third.

2. A common first-trimester challenge is…

Answer B. Early symptoms.

3. Moderate exercise in early uncomplicated pregnancy…

Answer B. Guideline evidence.

4. A good strategy for nausea is…

Answer B. Flexibility.

5. Pelvic floor training can start…

Answer B. Early is good.

Short-answer & application questions

  1. Design a session for the first trimester.
  2. List modifications for common symptoms.
  3. Explain warning signs to a client.

Key takeaways

  • Weeks 1–13: fatigue, nausea, breast tenderness; physical changes are small.
  • Continue usual training at moderate intensity if comfortable
  • Adjust timing for nausea and fatigue
  • Begin pelvic floor training

Connected topics

References

  1. Mottola MF, Davenport MH, Ruchat SM, et al. (2018). 2019 Canadian guideline for physical activity throughout pregnancy. British Journal of Sports Medicine, 52(21):1339–1346. doi:10.1136/bjsports-2018-100056 Guideline check pending
  2. American College of Obstetricians and Gynecologists (2020). Physical activity and exercise during pregnancy and the postpartum period: ACOG Committee Opinion No. 804. Obstetrics & Gynecology, 135(4):e178–e188. Guideline check pending
  3. Woodley SJ, Lawrenson P, Boyle R, et al. (2020). Pelvic floor muscle training for preventing and treating urinary and faecal incontinence in antenatal and postnatal women. Cochrane Database of Systematic Reviews, CD007471. Systematic review check pending

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