Short answer
Pelvic-floor muscle training can target several different qualities: strength, endurance, power, coordination, and relaxation. They are related but not interchangeable. A strong contraction may still have poor timing; a long hold may be difficult to release; a quick response may lack endurance; and a person with pain or emptying difficulty may need relaxation and coordination rather than more force.
This is why PFMT is broader than doing as many hard squeezes as possible. The goal determines which quality matters, and assessment determines the appropriate starting point.
Why the distinctions matter
“Kegel” often describes the visible action in a programme: voluntarily contract and release the pelvic floor. Training changes when the same action is performed with different effort, duration, speed, rest, position, timing, and purpose.
The International Continence Society assessment terminology standardizes these qualities so clinicians and researchers can describe function consistently. The definitions do not turn a timer into a clinical assessment.
Strength
Strength is the force-generating capacity of the muscles. In plain language, it concerns how much controlled force the pelvic floor can produce.
Strength is relevant when the goal requires a more forceful contraction, but a useful contraction still needs the correct inward direction, normal breathing, and a full release. A hard squeeze that becomes a downward push is not improved strength.
You cannot accurately grade pelvic-floor strength from sensation alone. Clinical assessment may use observation, palpation, pressure measurement, dynamometry, ultrasound, or other methods depending on context and consent.
Endurance
Endurance is the ability to sustain or repeat useful force before fatigue changes performance. It can involve maintaining a contraction or producing repeated contractions while preserving quality.
A timer records elapsed time, not force. If the inward lift fades halfway through a hold, the displayed duration overstates useful endurance. Release and recovery are also part of the task.
Endurance training is not the same as staying clenched during the day. Continuous low-level gripping removes the clear alternation between work and rest.
Power
Power concerns producing force quickly. For the pelvic floor, this may matter when a rapid response is needed around a sudden pressure event.
Fast contractions still need control and a distinct release. Speed should not be added before a person can identify the movement. Rapidly squeezing the buttocks or repeatedly bracing the abdomen is not pelvic-floor power training.
A quick pre-contraction before a cough is also a timing skill; it cannot be reduced to speed alone.
Coordination
Coordination is the ability to use contraction or relaxation at the right time with the right task. The ICS report includes relationships between the pelvic floor and organ function, body movement, or a rise in abdominal pressure.
Examples include:
- relaxing appropriately for normal urination or bowel emptying;
- contracting before an expected cough or lift when clinically appropriate;
- keeping breathing and pressure strategy coordinated;
- switching from contraction back to rest;
- avoiding a paradoxical contraction when release is needed.
Coordination explains why a person can have adequate force but still experience difficulty with timing or emptying.
Relaxation
Relaxation is the return toward the resting state after contraction and the ability to reduce activity when a task requires it. It is an active part of normal pelvic-floor function, not a secondary detail.
Complete release matters between repetitions and for bladder, bowel, sexual, and pain-related function. Difficulty relaxing can coexist with weakness; “tight” and “strong” are not synonyms.
Persistent pain, emptying difficulty, or delayed release needs assessment rather than a self-prescribed stronger contraction.
Repeatability and motor control
Clinical terminology also considers repeatability and broader motor control. Repeatability asks whether useful force can be reproduced before a detectable decline. Motor control includes how the nervous system organizes the movement, including awareness, isolation, timing, and adaptation to a task.
These concepts overlap with the five main qualities and help explain why one maximal contraction does not describe overall function.
One exercise cannot maximize every quality at once
Changing the task changes the training stimulus:
- higher controlled effort emphasizes force;
- a sustained quality-limited hold emphasizes endurance;
- a brief rapid contraction emphasizes speed and power;
- an event-linked contraction emphasizes timing;
- a deliberate return to rest emphasizes relaxation and control.
A programme may include more than one task, but adding every variation immediately is not comprehensive training. It is unstructured volume.
Match the quality to the goal
For a symptom-treatment programme, the relevant quality depends on diagnosis and assessment. Stress leakage may involve force and timing. Urgency management may involve coordination within a broader bladder programme. Bowel emptying may require release. Pelvic pain may require relaxation and specialist care. Postoperative rehabilitation depends on procedure and healing stage.
These examples describe possible programme logic; they are not a diagnosis or prescription for every person with that symptom.
How to notice quality without claiming a measurement
A self-guided user can ask:
- Was the movement inward rather than downward?
- Did I breathe normally?
- Did the contraction remain distinct for the intended task?
- Did I release fully?
- Did nearby muscles take over?
- Did symptoms remain stable during and after practice?
These observations help decide whether to continue, regress, or seek feedback. They do not produce a valid strength grade or confirm normal function.
Better pelvic-floor function is not the largest squeeze. It is the right amount of contraction or relaxation, produced with control, at the time the body needs it.
What to do next
Read how an evidence-based Kegel programme should progress to see how training qualities can be changed one at a time. Use contracting and fully relaxing for the foundation shared by each quality.
Sources
- Frawley H et al. “An International Continence Society (ICS) report on the terminology for pelvic floor muscle assessment.” Neurourology and Urodynamics. 2021;40:1217–1260. Official ICS report.
- Cardozo L, Rovner E, Wagg A, Wein A, Abrams P, editors. Incontinence. 7th edition. International Consultation on Incontinence and International Continence Society; 2023. Official ICS publication.
- Bø K, Berghmans B, Mørkved S, Van Kampen M, editors. Evidence-Based Physical Therapy for the Pelvic Floor. 3rd edition. Elsevier; 2023. Chapter 6. Official publisher record.
- Bø K, Frawley HC, Haylen BT, et al. “An IUGA/ICS joint report on the terminology for the conservative and nonpharmacological management of female pelvic floor dysfunction.” International Urogynecology Journal. 2017;28:191–213. PubMed record.