The Pelvic Floor: What It Is, Why It Weakens, and How to Train It

Most people first hear about the pelvic floor after childbirth, or when continence becomes an issue. By then, the muscle has often been weakened for years. This article explains what the pelvic floor actually is, why it weakens, and what the clinical evidence says about how to restore it.

 

What the Pelvic Floor Is

 

Anatomy

The pelvic floor is a group of muscles and connective tissues that form a hammock-like structure at the base of the pelvis. It stretches from the pubic bone at the front to the coccyx at the back, and from one sitting bone to the other. It supports the bladder, uterus or prostate, and rectum from below — preventing these organs from descending under the constant pressure of gravity and intra-abdominal forces generated by breathing, movement, and effort.

The primary muscles are the levator ani — comprising the pubococcygeus, iliococcygeus, and puborectalis — and the coccygeus. Together they function as a dynamic, responsive structure: contracting reflexively during coughing, sneezing, or lifting to prevent leakage, and relaxing to allow urination, defecation, and penetration.

The pelvic floor is innervated by the pudendal nerve and branches of the sacral plexus. Its dual role — structural support and dynamic response — means that both weakness and excessive tension can cause dysfunction. An undertrained pelvic floor loses its capacity to contract sufficiently. An overtrained or hypertonic one loses its capacity to relax, which produces a different set of problems including pain, vaginismus, and difficulty with penetration.

 

Who has a pelvic floor

Everyone. The pelvic floor is present in all bodies regardless of sex. In women, it surrounds the urethra, vagina, and anus. In men, it surrounds the urethra, base of the penis, and anus. Its functions — continence, pelvic organ support, and sexual function — are universal. The clinical literature has historically focused on women, particularly in the postpartum context, but pelvic floor dysfunction is documented in men as well, and training is equally relevant and effective across sexes.

 

Why the Pelvic Floor Weakens

The pelvic floor is subject to several categories of stress that gradually reduce its strength and responsiveness over time.

Pregnancy and childbirth. The weight of a growing uterus places sustained downward pressure on the pelvic floor throughout pregnancy. Vaginal delivery — particularly prolonged labour, large babies, or instrumental delivery — can stretch and damage the levator ani and pudendal nerve, sometimes significantly. Caesarean delivery does not fully protect against pelvic floor dysfunction, as the prenatal pressure still occurs regardless of delivery mode.

Hormonal changes. Oestrogen supports the elasticity and tone of pelvic floor tissues. The hormonal shifts of perimenopause and menopause produce a progressive reduction in tissue quality that, without targeted training, leads to measurable loss of pelvic floor strength. This is why urinary incontinence rates increase significantly after menopause.

Chronic increased intra-abdominal pressure. Repeated heavy lifting, chronic constipation, persistent coughing (including from smoking), and high-impact exercise without adequate pelvic floor engagement all place sustained stress on the pelvic floor that, over time, contributes to weakness and descent.

Sedentary lifestyle. Like all skeletal muscles, the pelvic floor responds to disuse by losing strength and tone. Unlike most muscles, it is rarely exercised deliberately and receives no training stimulus from typical daily activity.

 

What Happens When It Weakens

Pelvic floor weakness produces a spectrum of symptoms whose severity depends on the degree of muscular insufficiency. The three most clinically significant are urinary incontinence, pelvic organ prolapse, and sexual dysfunction.

Urinary stress incontinence

Urinary stress incontinence — the involuntary loss of urine during effort, coughing, sneezing, or physical activity — is the most common presentation of pelvic floor weakness. It occurs when intra-abdominal pressure exceeds the urethral closure pressure that a weakened pelvic floor can no longer sustain. In France, it affects approximately one woman in four over the age of 35, according to data from the Haute Autorité de Santé. European-wide estimates place the prevalence of urinary incontinence in adult women between 25% and 45%.

Haute Autorité de Santé (HAS) / ANAES (2000). Bilans et techniques de rééducation périnéo-sphinctérienne pour le traitement de l'incontinence urinaire chez la femme. Service des recommandations et références professionnelles.

 

Pelvic organ prolapse

When the pelvic floor can no longer adequately support the pelvic organs, one or more of them — bladder, uterus, or rectum — may descend toward or through the vaginal opening. Prolapse ranges from mild (detectable only on examination) to severe (causing significant discomfort and functional impairment). It is strongly associated with childbirth, but also occurs in nulliparous women as a consequence of chronic straining or hormonal change.

 

Sexual dysfunction

Reduced pelvic floor strength is associated with decreased vaginal tone, reduced sensation during penetration, difficulty reaching orgasm, and pain during intercourse. These consequences are discussed in detail in our dedicated article on the pelvic floor and pleasure. What is relevant here is that they share a cause with continence dysfunction — and respond to the same training.

 

What the Clinical Guidelines Say

Pelvic floor muscle training is the first-line clinical recommendation for urinary stress incontinence across all major European and international health guidelines.

In France, rééducation périnéale has been inscribed in the public health code as a recognised clinical intervention since 1985. It is systematically prescribed postpartum and in cases of stress incontinence. The HAS recognises multiple training modalities including supervised exercises, biofeedback, electrostimulation, and vaginal cone training.

Haute Autorité de Santé (HAS) / ANAES (2000). Bilans et techniques de rééducation périnéo-sphinctérienne pour le traitement de l'incontinence urinaire chez la femme. Service des recommandations et références professionnelles.

A French-led systematic review by researchers at the University of Orléans and Paris Nanterre, published in the International Journal of Environmental Research and Public Health, evaluated the effectiveness of multiple pelvic floor training modalities across women with urinary incontinence. The review confirmed that all modalities — exercises alone, biofeedback, electrostimulation, and vaginal cones — produced measurable improvements in pelvic floor strength and continence outcomes, with combined approaches yielding the strongest results.

Alouini, S., Memic, S., & Couillandre, A. (2022). Pelvic floor muscle training for urinary incontinence with or without biofeedback or electrostimulation in women: A systematic review. International Journal of Environmental Research and Public Health, 19(5), 2789.

In the United Kingdom, the National Institute for Health and Care Excellence (NICE) recommends supervised pelvic floor muscle training of at least three months as the first-line treatment for stress and mixed urinary incontinence — a recommendation reaffirmed in its 2021 guidelines on pelvic floor dysfunction. The recommended programme comprises at least eight contractions performed three times per day, with progressive increases in hold duration as strength improves.

National Institute for Health and Care Excellence (NICE) (2021). Pelvic floor dysfunction: prevention and non-surgical management. NICE guideline NG210.

 

Weighted Vaginal Balls: The Clinical Evidence

Weighted vaginal balls — also called vaginal cones — are a validated training modality recognised by the HAS and evaluated in multiple clinical trials. Their mechanism is simple: inserted vaginally, they require the pelvic floor to contract and sustain that contraction in order to retain the weight against gravity during standing and movement. The muscle works continuously during wear, building strength and endurance without requiring conscious repetition.

A randomised clinical trial published in Physiotherapy Research International compared pelvic floor exercise training with weighted vaginal ball training across 37 women with stress urinary incontinence over four months. Both groups showed significant reductions in urinary leakage and increases in pelvic floor muscle strength. The reduction in urinary leakage was significantly greater in the vaginal ball group — suggesting that continuous passive resistance produces a different and in some respects more effective training stimulus than voluntary contractions alone.

Arvonen, T., Fianu-Johansson, A., & Tyni-Lenné, R. (2001). Effectiveness of two conservative modes of physical therapy in women with urinary stress incontinence. Physiotherapy Research International, 6(4), 185–194.

A study published in the European Journal of Obstetrics, Gynecology and Reproductive Biology compared pelvic floor exercises with vaginal cone therapy in women with genuine stress incontinence and found both interventions equally effective — with 53% of the exercise group and 57% of the cone group reporting significant improvement. The authors concluded that vaginal cones represent a valid alternative to conventional exercise, particularly for women who have difficulty correctly identifying and isolating pelvic floor contractions without guidance.

Cammu, H., & Van Nylen, M. (1998). Pelvic floor exercises versus vaginal weight cones in genuine stress incontinence. European Journal of Obstetrics, Gynecology and Reproductive Biology, 77(1), 89–93.

 

How to Train Correctly

 

Identifying the right muscles

The most common error in pelvic floor training is recruiting the wrong muscles — the abdominals, gluteals, or inner thighs — instead of the pelvic floor itself. Research consistently finds that up to one in two women performs Kegel exercises incorrectly without prior guidance. The HAS and NICE both recommend that training begin with professional assessment to confirm correct muscle identification.

The simplest identification method is to imagine stopping the flow of urine mid-stream: the muscles that would perform that action are the pelvic floor muscles. This should be used as an identification exercise only — interrupting urination repeatedly can lead to incomplete bladder emptying and increased infection risk.

 

Exercise protocol

NICE guidelines recommend a minimum of eight contractions performed three times per day as the baseline programme. Each contraction should be held for as long as the muscle can sustain it — building from two to three seconds toward ten seconds over weeks — before full relaxation. The relaxation phase is as important as the contraction: a pelvic floor that cannot fully release is as dysfunctional as one that cannot contract, and produces its own set of symptoms.

For weighted ball training, 30 minutes of daily wear in a standing or active position provides the passive resistance training that complements active contraction exercises. The two are not alternatives but complements: active exercises develop the speed and force of contraction; passive weighted resistance develops sustained endurance. Weight should be progressed incrementally as the lighter ball becomes easy to retain — following the principle of progressive overload that governs all effective muscle training.

 

When to consult a professional

Self-directed pelvic floor training is appropriate for most people. However, professional assessment is recommended in the following situations: persistent urinary or fecal incontinence, symptoms of pelvic organ prolapse, pain during or after training, difficulty identifying the correct muscles, postpartum recovery, or symptoms that do not improve after six to eight weeks of consistent training. In France, pelvic floor physiotherapy is covered under the public health system and can be prescribed by a general practitioner, gynaecologist, or midwife.

 

Prevention Is the Real Argument

The clinical guidelines focus on treatment because that is when people present. But the most powerful argument for pelvic floor training is preventive. The muscle weakens gradually, over years, before symptoms become significant. By the time urinary leakage or reduced sensation becomes noticeable, measurable loss has already occurred.

Training the pelvic floor before dysfunction develops — during reproductive years, before pregnancy, alongside regular physical activity — maintains baseline strength that protects against the cascade of consequences that follow its loss. It is the only muscle group whose systematic neglect has direct consequences for continence, organ support, and sexual function simultaneously. It is also one of the only muscle groups whose condition can be meaningfully improved at any age, including well into menopause and beyond.