Jenny Xu

In Run Legends, you sprint to land a hit and slow to a jog to heal. Your pace is the joystick. Your breath is the mana bar. And the whole fight plays out in your ears.

Jenny Xu calls it a "heads-up game" - one you play without staring at a screen. Attacks, incoming damage, and enemy taunts arrive entirely through spatial audio and a buzz of haptics, so a player can keep their eyes on the sidewalk and their legs moving. It is a turn-based RPG that happens to require cardio. Speed up and you unleash a heavier strike; ease off and you tend your wounds. The villains are the Sappers, draining humanity's energy, and the only way to beat them is to actually move.

That premise sounds like a gimmick until you learn who made it. Xu is a competitive distance runner who logged roughly 70 miles a week as a Division III athlete at MIT and has a marathon personal best of 2:56, a shade under 6:42 per mile. She did not bolt fitness onto a game as a marketing hook. She built the game she wanted to play on her own long runs.

Talofa Games, the San Francisco studio she founded in 2021, exists to make "fitness games for good" - titles designed to leave players mentally and physically healthier than it found them. It is a deceptively ambitious thing to attempt in an industry whose business model usually rewards keeping you seated and scrolling. Xu is trying to invert that: get people outdoors, get them moving, get them playing together across cities and time zones.

Scrappy on purpose

She has raised $6.3 million in seed funding, led by Chamaeleon with a16z Games Speedrun, Basis Set Ventures, Insight Partners, and 1Up Ventures joining in. She has hired veterans from EA, 2K, and Riot Games. And she still writes code herself. "Having made games for so long, I love just having that scrappy vibe and doing coding myself," she has said. For a founder who could easily disappear into decks and hiring loops, the hands-on habit is a tell about how she works.

Run Legends is not her first rodeo. Not close. Xu has shipped more than ten mobile titles that together have crossed ten million downloads. Before Talofa she ran a solo shop called JC Soft, whose real-world running game won the grand prize at Niantic's Beyond Reality Developer Contest in 2019, the same year she walked out of MIT with a computer science degree.

The username no one knew

Long before Forbes came calling, Xu released games under the handle "Chibixi." The anonymity was strategic. Hiding behind a username meant she got unfiltered, honest feedback from players who had no idea a teenager was behind the work - and no reason to be polite. By the time she was named to Forbes 30 Under 30 as an MIT junior in 2018, she had already designed more than 120 games. She described her early catalog, cheerfully, as "experimental horror-comedy."

The through-line from those first games to Run Legends is connection. Xu keeps returning to the idea that games should pull people together and get them off the couch, not isolate them further. It is a conviction she has lived out in more than pixels.

A resume built at speed

Xu did not arrive at fitness gaming by accident, and she did not arrive alone. Before founding her own studio she cut her teeth inside the industry's engine rooms, with stops that included Google, the mobile studio N3TWORK, and EA. That mix matters: she learned how the giants ship at scale and then walked away to build something small and strange. One of her earlier titles, an adventure game called Monster Walk, climbed into the Top 5 of the App Store's free adventure category. Her games have been featured by Apple and Google more than ten times over. For a developer who started as an anonymous teenager posting experiments online, the reach is remarkable, and she got there faster than most people finish an undergraduate degree.

Run Legends itself is the maturation of an idea she had been circling for years. An earlier project, a social running game she described as "Run to My Heart," paired players with online friends and virtual companions toward shared fitness goals, with an audio-focused design that kept safety front of mind by refusing to demand a runner's eyes. You can see the DNA of that experiment in the finished game: the same insistence that a phone in your pocket should not become a hazard on the trail, the same belief that other people are the best reason to keep going.

1,000 days, no skips

Consider the "Abs With Jenny" class. Between 2020 and 2023, Xu taught it for a thousand consecutive days, drawing more than 700 participants. A thousand days is not a marketing stunt - it is a personality. It is the same trait that gets a runner out the door at 6 a.m. in February and the same one that keeps a founder writing her own code when she could delegate it.

You can see that discipline reflected in the product decisions. Xu deliberately avoided building what she calls a "content treadmill" - the endless drip of new story chapters that many mobile games depend on to hold attention. Instead, Run Legends is systems-driven, so the story emerges from what players do in battle rather than from a writers' room racing to feed the machine. It is a design choice that respects both the player's time and the small team's sanity.

The wellness angle is not window dressing either. During the beta, some players reported losing five to ten pounds in a month. Peak concurrent workouts hit 55,000. Battles run five to fifteen minutes - short enough to squeeze into a lunch break, structured enough to keep you coming back. Xu built a game people could win at while getting healthier, which is a rarer thing than it should be.

Paying it forward

Her sense of the industry's gaps is personal. During her senior year at MIT she founded Game On Girls to connect female students with local game developers, a small counterweight to a field she has openly said needs to do better on diversity. She has since served on the IGF game design jury and been featured in books on women and leadership in games, among them Women in Gaming: 100 Professionals of Play, Changing the Game, and Take Command. The recognition is nice. The through-line - build the thing you wish existed, then hold the door open behind you - is the point.

What makes Xu genuinely unusual is not any single credential. Plenty of founders can point to a Forbes list or a seed round. Fewer can say they qualified for the Boston Marathon, taught a fitness class for a thousand straight days, wrote their own game code, and still found time to build a company staffed with alumni of EA, 2K, and Riot. The pattern is consistency at an almost stubborn scale, applied equally to running mileage and shipping schedules. She treats both as things you simply do, every day, without negotiation.

The bet underneath Talofa is that entertainment and effort do not have to be enemies. For most of gaming's history, the two have been sold as opposites - the couch versus the trail, the screen versus the sky. Xu's whole career is an argument that the line was always artificial. Make the game good enough and the exercise is invisible. Make the exercise the input and the game becomes something no controller can replicate. Whether that thesis scales into a category or stays a beloved niche is the open question. Either way, she has already proven the harder part: that hundreds of thousands of people will lace up and play.