Off the chart. The most outrageous so far.
High above the Earth, in brief windows of manufactured weightlessness, engineers and athletes are working together to solve one of deep-space exploration's most fundamental challenges: how to keep the human body from betraying itself in the absence of gravity. A British device called HIFIm, tested aboard a parabolic flight by Olympic rower Matthew Wells, joins a quiet international competition to replace the heavy, time-consuming fitness equipment of today's space stations with something compact enough for lunar habitats and efficient enough to preserve muscle, bone, and coordination across the long silences of space travel. As NASA, ESA, and partner agencies press forward with Artemis missions designed to return humans to the Moon — this time to stay — the question of how astronauts will maintain their bodies has moved from background concern to urgent engineering priority.
- Without gravity's constant pull, astronauts begin losing muscle mass and bone density almost immediately — a biological clock that no mission can afford to ignore.
- Current space station fitness equipment is heavy, power-hungry, and consumes hours of an astronaut's already-compressed day, making it poorly suited for the leaner, longer missions ahead.
- A former aircraft engineer turned pilates studio owner built HIFIm — a vibration-isolating, electricity-free rowing device — after recognizing that a cancer patient's bone loss and an astronaut's microgravity deterioration were the same problem in different settings.
- Olympic bronze medalist Matthew Wells strapped into the prototype aboard a parabolic flight plane, rowing through 22-second bursts of true weightlessness to generate the validation data that no ground-based test could provide.
- HIFIm now competes against ESA's multi-mode E4D and NASA's flywheel device, with backing from multiple space agencies and a narrowing window as Artemis lunar missions accelerate toward deployment.
Matthew Wells, an Olympic bronze medalist in rowing, found himself 28,000 feet above the ground, strapped into a machine unlike any he had trained on before. As the aircraft executed a controlled dive, his body lifted away from the seat and he rowed through 22 seconds of genuine weightlessness — testing a British invention called HIFIm, short for High-Frequency Impulse for Microgravity, one of several devices now competing for a place on the next generation of spacecraft and lunar habitats.
The urgency behind the competition is biological. In microgravity, muscles and bones begin to deteriorate almost immediately. Astronauts lose coordination, cardiovascular fitness, and the physical capacity their missions demand. The equipment currently aboard space stations works, but it is bulky, power-hungry, and consumes hours of an astronaut's day — poorly suited to the leaner, longer missions that agencies like NASA, ESA, and the UK Space Agency are now planning under the Artemis program, which aims to return humans to the Moon to stay.
HIFIm has an unlikely origin. Its creator, a former aircraft engineer who also runs a pilates studio, conceived the device while working with a cancer survivor suffering severe bone density loss — and recognized the parallel with what astronauts face in orbit. The prototype was built at Pinewood Studios by the special effects team behind the film 1917, engineered to run without electrical power and to isolate vibrations so it would not disturb sensitive experiments or spacecraft structures.
But Earth-based testing has limits. Parabolic flights — where a modified aircraft climbs steeply, then dives, producing roughly 22 seconds of microgravity per maneuver — offered researchers the real conditions they needed. Wells, who has pursued extreme physical challenges since his Olympic success, described the experience as unlike anything he had done before. For the engineers and agencies behind the project, those brief windows of weightlessness produced something more valuable: data that could determine whether HIFIm earns a place on the habitats carrying humans deeper into space.
The device faces real competition. ESA's E4D, developed by the Danish Aerospace Company, offers four training modes and motion capture technology. NASA's Artemis II mission carried its own flywheel device. Each represents a different answer to the same question. As the world's space programs accelerate their lunar ambitions, the window for proving which solution works best — and which human bodies will depend on — is narrowing.
Matthew Wells, an Olympic bronze medalist in rowing, strapped into a specially designed machine 28,000 feet above the ground and began to row. For 22 seconds, as the aircraft around him executed a controlled dive, his body lifted away from the seat. There was no water beneath him, no resistance but the equipment itself—just the strange sensation of weightlessness that astronauts experience in orbit. He was testing a British invention called HIFIm, short for High-Frequency Impulse for Microgravity, one of several pieces of exercise equipment now in development across the world for the next generation of space missions.
The reason is straightforward and urgent: astronauts cannot afford to grow weak. In the absence of gravity, muscles and bones begin to deteriorate almost immediately. Without the constant load that Earth's pull exerts on our bodies, our skeletal system starts to break down. Astronauts lose coordination and cardiovascular fitness. They become less capable of performing the physical tasks their missions demand. Current exercise equipment on space stations works, but it is heavy, power-hungry, and demands hours of an astronaut's day. Scientists and engineers across multiple space agencies—NASA, the European Space Agency, the Canadian Space Agency, and the UK Space Agency—have begun a quiet competition to design something better.
The HIFIm device emerged from a European competition to create exercise equipment for the Gateway Space Station, an orbital outpost designed to support lunar exploration. Though Gateway's role has shifted in recent years, the urgency of the problem has not. Dr. Meganne Christian, a reserve astronaut for the European Space Agency and senior exploration manager at the UK Space Agency, describes the current moment as genuinely exciting. Artemis missions are returning humans to the moon, she notes, "this time to stay." The equipment being tested now will likely be used not just on space stations but on the lunar surface itself.
HIFIm is not alone in the race. The European Enhanced Exploration Exercise Device, or E4D, developed by the Danish Aerospace Company under ESA commission, offers four different modes—resistive training, cycling, rowing, and rope pulling—along with motion capture technology to track performance. NASA's Artemis II mission, which flew around the moon in recent years, carried a specialized device called the flywheel. Each represents a different approach to the same problem: how to keep the human body functional in an environment where gravity does not exist.
The British device has an unusual origin story. Its creator, a former aircraft engineer who also owns a pilates studio, conceived the idea while working with a cancer survivor struggling with severe bone density loss. He recognized a parallel with the problem facing astronauts and believed the International Space Station was overlooking an obvious solution. The prototype was built at Pinewood Studios by special effects engineers—the same team that won an Oscar for the film 1917 and works on Star Wars, James Bond, and Mission Impossible productions. The device was engineered to operate without electrical power and to isolate vibrations so it would not disturb sensitive experiments or the structural integrity of a spacecraft.
But theory and Earth-based testing can only reveal so much. To truly validate the equipment, researchers needed to test it in actual weightlessness. That is where the parabolic flights come in. A specially modified aircraft climbs steeply, then dives, creating 22 seconds of microgravity with each maneuver. The plane repeats this cycle dozens of times, giving researchers brief windows to gather data. The rowing attachment that Wells tested could not be properly evaluated on solid ground; it required the real thing.
Wells, who has made a habit of pursuing physical challenges since his Olympic success—boxing, Ironman competitions, long-distance swimming—describes the experience as unlike anything he has done before. "Off the chart," he says. "The most outrageous so far." For him, it was another step in a personal journey of testing his limits. For the researchers and space agencies backing the project, it was a crucial moment of validation. The data gathered during those 22-second windows of weightlessness will help determine whether this British invention earns a place on the spacecraft and habitats that will carry humans deeper into space. The competition is real, the stakes are high, and the window of opportunity—as the world's space programs accelerate their lunar ambitions—is narrowing.
Notable Quotes
In space we don't experience any forces, our muscles, our bones immediately start to diminish because we're not being loaded by those forces.— Dr. Dan Cleather, professor of strength and conditioning at St Mary's University
We are at a really exciting moment in space exploration where these devices can be used for new space stations and the lunar surface.— Dr. Meganne Christian, reserve astronaut for the European Space Agency
The Hearth Conversation Another angle on the story
Why does it matter so much that this equipment works in actual weightlessness? Why not just simulate it better on Earth?
Because the human body responds to gravity in ways we can't fully replicate. Muscles and bones are engineered by evolution to work against constant downward force. In a parabolic flight, you get 22 seconds of the real thing. That's enough to see if the device actually does what you designed it to do.
So the rowing machine Wells tested—why rowing specifically? Why not just use the equipment that already exists in space?
Current machines work, but they're heavy, they consume power, and they demand hours of an astronaut's day. Rowing is efficient. It works multiple muscle groups at once. And this device was designed to work without electricity, which matters when you're trying to keep a spacecraft lean and functional.
The fact that it was built by Oscar-winning special effects engineers seems almost absurd. How does that happen?
It's not absurd at all. You need people who understand how to build things that work in extreme conditions, that are lightweight, that won't fail. Those engineers have spent decades solving exactly those kinds of problems for film. The skills transfer directly.
What happens if none of these devices work well enough? What's the fallback?
There isn't one, really. Astronauts have to stay fit. If they don't, they can't perform their missions. So the pressure to get this right is immense. That's why multiple space agencies are backing multiple designs. One of them has to work.
Does Wells know his test might determine whether this equipment actually flies to the moon?
Almost certainly. He's not just a rower being asked to row. He's part of a validation process that could shape how humans exercise in space for the next decade. That's a lot of weight to carry, even in weightlessness.