Why Most Fitness Apps Fail and What Video Games Get Right
I had a dexascan in December that told me my body fat had crept up to 23.7%. I knew it. I could feel it. But seeing the number still hit different.
So I did what everyone does, I opened an app. I tracked calories for two weeks, hit my macros most days, and then quietly stopped. Not because I didn’t know what to eat. I know exactly what to eat. I’ve read the books. I can recite the protein targets in my sleep. The knowing was never the problem.
The doing was.
And that’s the thing nobody wants to hear: knowing what to do and actually doing it are completely different problems, and almost every fitness app on the market solves the wrong one.
The willpower myth
Here’s the model most apps are built on: give people information, remind them to act on it, and they will. Track your calories. Log your workout. Hit your streak. The assumption underneath all of it is that you have a reservoir of willpower and the app’s job is to point that willpower in the right direction.
The science says that’s backwards.
Judson Brewer’s research on anxiety and habit loops shows that willpower and reasoning both depend on your prefrontal cortex, and that’s exactly the part of your brain that goes offline when you’re stressed, tired, or overwhelmed. The moments when you most need willpower are the moments when you have the least of it. Trying to white-knuckle your way through a craving when your PFC has checked out is like trying to start a car with a dead battery. You can turn the key all you want.
Ben Carpenter puts it more bluntly in Fat Loss Habits: “Achieving better outcomes does not always mean you exerted more willpower. It often just means you adopted better systems that actually decreased your need for willpower in the first place.”
So if willpower isn’t the lever, what is?
What actually changes behavior
Paras Chopra built a habit coaching app called Nintee. Raised VC funding, built the product, ran it for a year, and then shut it down. His post-mortem is one of the most honest pieces I’ve read about why behavior change apps fail:
“An app has marginal influence in a human’s life versus that of friends, family, culture, and immediate environment.”
That’s a brutal sentence if you’re building an app. But he didn’t stop there. He broke down what actually moves the needle into a framework I keep coming back to:
Gas — motivation. The more motivated you are, the more likely you’ll do something. But motivation fluctuates daily. You can’t build on something that changes with the weather.
Brake — friction. The smaller the gap between your current life and the new behavior, the more likely you’ll do it. This is the lever that actually works.
Context and repetition — a trigger, a place, a time. You don’t decide to brush your teeth every morning. You just do it because the cue (waking up) and the context (the bathroom) are fused to the action. That’s what a habit is.
The Nintee team learned two things the hard way. First, they were suggesting changes that were too big. Telling someone to “give up sugar” is equivalent to reading a tweet — it sounds good and changes nothing. Second, even when they suggested tiny actions, they never showed people how those tiny things compound. They assumed people would intuit the trajectory. People don’t.
The ADHD problem (which is everyone’s problem)
Ari Tuckman’s ADHD Productivity Manual frames it as “too much present, not enough future.” People with ADHD experience temporal discounting more intensely — the further a consequence is from right now, the less it registers emotionally. But here’s the thing: everyone does this. ADHD just turns the volume up.
When you’re staring at a piece of cake, the reward is immediate and vivid. The consequence — your body fat percentage three months from now — is abstract and distant. Your brain literally cannot feel the future consequence with enough intensity to override the present reward.
Tuckman’s solution is to make consequences more immediate, more frequent, more external, and more salient. Don’t rely on natural consequences that arrive too late. Create artificial ones that arrive right now.
That sounds a lot like a game to me.
Why games are different
Games solve the behavior change problem in ways that apps and willpower never can, because games give you four things simultaneously:
1. Immediate feedback. You press a button, something happens. You complete a quest, you get a reward. The gap between action and consequence is zero. In fitness, the gap between eating well today and seeing results is weeks or months. A game compresses that gap to seconds.
2. Tiny, escalating challenges. Good games don’t start by asking you to fight the final boss. They start with a slime. Then a slightly bigger slime. The difficulty curve is so gradual you don’t notice you’re getting stronger. This is exactly what Chopra’s team learned — suggest something extremely tiny AND show how it compounds. Games do this naturally through their progression systems.
3. Environmental design, not willpower. The best games don’t ask you to resist temptation. They restructure your environment so the right action is the obvious action. Carpenter’s insight that “habits are automatic responses to contextual cues that largely happen outside your conscious awareness” is basically a description of game mechanics. The game IS the environment. The cues are built in.
4. Curiosity over discipline. Brewer’s big insight is that curiosity is a more sustainable reward than willpower. When you’re curious about what happens next — what’s behind that door, what unlocks after this level — you’re intrinsically motivated. You don’t need to force yourself. The ADHD research confirms this: performance is driven by interest, energy, and novelty. Games are interest, energy, and novelty engines.
The skill tree as scaffolding
There’s a concept in learning science called scaffolding — providing structured support and gradually releasing responsibility. Novices need more guidance than experts. You don’t hand someone a barbell and say “figure it out.” You show them a bodyweight squat first, then add the bar, then add weight.
How Learning Happens lays out the evidence: distributed practice beats cramming, retrieval practice beats re-reading, and cognitive load must be managed or learners shut down. A skill tree is all of these things at once. It distributes the learning over time. It requires you to recall and demonstrate before you advance. And it limits what’s visible so you’re not overwhelmed by everything you don’t know yet.
The skill tree is an evidence-based learning architecture wearing the clothes of a game.
What this means for what I’m building
I’m building Glow Quest (name subject to change), a gamified habit builder for getting lean and staying lean. But “gamified habit builder” undersells what I think this actually is. It’s not a calorie tracker with achievements bolted on. It’s an attempt to build the kind of environment that behavioral science says actually changes people.
The tree starts with the smallest possible action. Not “eat 160g of protein today.” More like “eat one meal today that has a protein source in it.” You do that for a few days, it becomes automatic, and then the next branch opens up.
The game doesn’t rely on your willpower. It restructures your defaults. It gives you a reward right now, not three months from now. It uses curiosity (what’s the next branch? what unlocks after this?) instead of discipline. And when you fall off, it doesn’t punish you. It meets you where you are, because Tuckman is right: doing something once is easy. Doing it every time, at the right time, is the actual problem. The game has to be designed for inconsistency, not perfection.
Nintee failed because, in Chopra’s words, an app has marginal influence. But a game isn’t an app. A game is an environment. And environment is the one thing the research says actually works.
The honest part
I don’t know if this will work. The Nintee post-mortem is a cautionary tale, not a blueprint. Chopra had VC funding, a team, and a year of user data, and he still concluded that the problem might be too hard for software alone.
But I think there’s a difference between a coaching app that sends you reminders and a game that makes you feel something when you level up. Between an app that tracks your streak and a game that makes the streak feel like it matters. Between information delivery and environmental design.
The research points somewhere specific: tiny actions, immediate feedback, curiosity-driven motivation, scaffolded progression, compassion for inconsistency. Games are the only medium I know that delivers all of those at once.
That’s the bet.