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In A Nutshell

  • A 10-minute daily exercise routine performed lying face-up was linked to measurable improvements in flexibility, agility, and standing balance in healthy young adults after just two weeks.
  • Both experiments involved small groups of young, healthy adults, so whether these results extend to older adults or people with medical conditions remains an open question.
  • Gains in muscle strength and explosive power, such as grip strength and sprint speed, were not observed, pointing to improved coordination rather than muscle growth as the likely driver.

A 10-minute daily routine performed flat on your back may be one of the most effective low-effort ways to improve balance, flexibility, and quickness, at least according to a new study out of Japan. Researchers tested a workout program designed to train the brain and body to work together from the most relaxed position possible. After just two weeks, participants showed measurable gains in select areas, and the improvement had nothing to do with building stronger muscles. Researchers suggest the changes may reflect improved coordination rather than muscle growth.

That conclusion cuts against a basic assumption in fitness: that getting better at balance means practicing balance. Traditional training often puts people in wobbly, unstable positions, like standing on one leg or balancing on foam pads. For older adults or people recovering from injuries, that kind of training can feel scary or even dangerous. The research team took the opposite approach. What if the body could learn better coordination while lying safely on the ground, then carry those skills into standing and moving?

Falls remain a leading cause of injury-related death among older adults in the United States, and many people avoid exercise because it feels too difficult or too risky. A program that delivers measurable gains from the safest position the human body can assume is worth a closer look.

How a Lying-Down Workout Trains Balance and Agility

The exercise routine has three parts, all performed face-up. First, participants lay with knees bent and used their fingertips to press on different sections of their stomach, then tightened the muscles in each area against that pressure, activating deep core muscles across nine zones of the abdomen. Second, they did a bridging movement: tilting the pelvis backward while keeping the stomach muscles engaged, then lifting the hips slightly off the floor to connect core stability with hip control. Third, they performed a series of leg movements designed to mimic the muscle-firing pattern that happens when the heel strikes the ground during walking, slowly extending the leg while pushing the heel outward. This portion also included a toe exercise resembling a game of rock-paper-scissors with the feet: clenching the toes, spreading them apart, and lifting the big toe on its own.

A physical therapist taught each participant the routine individually on the first day and again one week in. Participants followed along with pictures and video at home and filled out daily checklists to confirm they had completed the exercises. No injuries or adverse events were reported during the study.

Two separate experiments were conducted. In the first, 17 healthy young men were randomly divided into two groups using a crossover design where every participant eventually served as both a test subject and a control, just at different times. Each phase lasted two weeks, with a two-week break in between. During the exercise phase, participants performed the 10-minute routine once daily at home. During the control phase, they went about their normal lives. At the start and end of each phase, researchers measured performance on six standard physical fitness tests used nationwide in Japan, including grip strength, a sit-and-reach flexibility test, sit-ups, standing long jump, a lateral side-step agility test, and a 50-meter sprint, along with a standing balance assessment using a platform that tracks how much a person sways.

What Improved After Two Weeks of Lying-Down Exercises

Results, published in PLOS ONE, were clear but selective. Flexibility improved noticeably: participants could reach significantly farther forward in the seated stretch test compared to the control phase. Agility improved as well, with participants completing significantly more side-steps in a 20-second lateral stepping drill. Standing balance also showed gains, but only when standing with feet together in a parallel position, a stance that makes balancing harder because the base of support is narrower.

Tests that depend on raw muscle strength and explosive power, such as grip strength, standing long jump, and the 50-meter sprint, showed no changes. Researchers weren’t surprised. Building bigger, stronger muscles typically requires weeks of high-intensity resistance training pushed to the point of exhaustion. A gentle 10-minute routine was never going to accomplish that. Prior research cited by the authors has shown that after just two weeks of moderate training, up to 80 percent of observed strength gains can be attributed to neural factors rather than muscle growth. The team interpreted the results as evidence that the program was helping the brain and body communicate better, improving coordination rather than building up muscle tissue.

A second experiment, involving 22 healthy young adults, 19 men and 3 women, dug deeper into how the program changed the way people actually move. Researchers attached small wireless motion sensors to five spots on participants’ bodies and measured acceleration in three directions during the side-step agility test.

After two weeks, participants again completed significantly more side-steps. The more telling result was in how their bodies moved during the task. While overall acceleration increased in the head and both legs, consistent with simply moving faster, the acceleration measured per individual step decreased in the head and upper body, suggesting more controlled upper-body movement per step. The torso and pelvis stayed relatively stable throughout.

Balance and agility routine
Forget balance boards and one-legged stands. New research suggests a simple 10-minute floor routine may improve balance and agility without ever getting up. (Image generated by StudyFinds)

Is The Exercise Routine Beneficial for Older Adults?

Researchers compared this pattern to a pendulum, with the upper body acting as a stable center point around which the rest of the body pivots during quick lateral movements. This connects to a well-established idea in movement science: the human body prioritizes keeping the head steady during motion because the head houses the eyes and the balance-sensing organs of the inner ear.

Both experiments involved small numbers of young, healthy participants, mostly men, so it is too early to say whether the results would hold up in older adults, people with medical conditions, or larger and more diverse groups. The intervention lasted only two weeks, and the second experiment lacked a control group. Still, the results point toward a direction worth pursuing.

The potential reach of this kind of program could extend well beyond young, healthy college students. Because the entire routine is performed lying down, a position where the body is at its most stable, it may be especially worth studying in people who find traditional balance training risky or out of reach. That includes older adults at risk of falling, people in the early stages of recovery after a stroke or injury, and anyone dealing with chronic back pain that makes upright exercise difficult.

The leg exercises specifically model the sequence of muscle activations that occur when the foot hits the ground mid-stride, a phase where the shin, thigh, and buttock muscles must fire in rapid coordination to support the weight of the entire upper body. Rehearsing that pattern in a gravity-reduced position may help the body coordinate those movements more effectively when it counts.

Of course, 10 minutes of lying-down exercises won’t replace a full fitness regimen. Muscle strength, cardiovascular endurance, and bone density all require their own dedicated training. But for a targeted, low-risk routine that takes less time than a cup of coffee to finish, the data from these early experiments make a reasonable case for further study, particularly in the populations that stand to benefit most.


Disclaimer: This article is based on a single peer-reviewed study conducted in healthy young adults over a short two-week period. Results may not apply to older adults, people with medical conditions, or individuals recovering from injury. Consult a qualified healthcare provider before beginning any new exercise program, particularly if you have a history of falls, back pain, or cardiovascular conditions. The findings are preliminary and should not be interpreted as clinical guidance.


Paper Notes

Limitations

The study has several limitations. Both experiments involved small sample sizes, 17 participants in Experiment 1 and 22 in Experiment 2, and all were healthy young adults, which limits how broadly the findings can be applied to older adults or people with medical conditions. Experiment 1 included only males, and Experiment 2 included only 3 females out of 22 participants. The intervention lasted just two weeks, so it remains unknown whether the improvements would persist over longer periods or continue to build with extended training. The study was open-label, meaning participants knew when they were in the exercise group, though outcome assessors were blinded to group assignments. Both trials were retrospectively registered rather than prospectively, as the researchers initially considered the study to fall outside the scope of a clinical trial given its low-risk nature and use of asymptomatic participants. Experiment 2 lacked a control group, using only a pre-post design, which makes it harder to rule out effects from practice or expectation. The dynamic balance assessment was limited to a side-step task focused on medial-lateral movement and did not capture directional-specific data such as rotational or front-to-back components.

Funding and Disclosures

The authors reported receiving no specific funding for this work. No competing interests were declared.

Publication Details

Authors: Atomi A, Sato M, Oyauchi M, Takano W, Shimizu M, Watanabe T, et al. | Title: “A supine exercise program linking trunk stability with lower extremity coordination is associated with improved body balance and agility: A study using randomized crossover and pre-post trial designs” | Journal: PLOS ONE, Volume 21, Issue 4 | Published: April 29, 2026 | DOI: 10.1371/journal.pone.0345749 | Editor: Mansour Abdullah Alshehri, Umm Al-Qura University, Saudi Arabia | Trial Registration: UMIN Clinical Trials Registry (UMIN000057589 and UMIN000057597) | Ethics Approval: Tokyo University of Agriculture and Technology Ethics Review Committee (approval numbers: 210901-0335 and 191106-3130)

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