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Can strength training beat stretching for flexibility?

NCT ID NCT07061041

Knowledge-focused Sponsor: Józef Piłsudski University of Physical Education Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jul 21, 2026 · Updated 2 times

Summary

This study compares two approaches to improve flexibility of the hamstrings and lower back: static stretching versus full range of motion strength training using the Romanian deadlift. Healthy adults will perform one of the two exercises once a week for six weeks. Flexibility is measured before and after the program to see which method works better.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

What this could lead to
If one method proves superior, it could guide more effective flexibility routines for athletes or rehab.
What could go wrong
This is a small, short-term study in healthy adults, so results may not apply to injured or older populations.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

54 people

The number who actually took part.

Started

Jul 2025

Finished

Aug 2025

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 25 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: Participants were required to be ≥18 years of age and free from musculoskeletal injuries or surgical procedures involving the lower extremities or trunk within the previous six months. Exclusion Criteria: Participants were excluded if they were \<18 years of age or had sustained a musculoskeletal injury or undergone surgery involving the lower extremities or trunk within the previous six months.

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As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Flexibility Static stretching Strength training effects

Contacts and locations

Locations

  • Józef Piłsudski Academy of Physical Education in Warsaw

    Warsaw, 00-968, Poland

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