Most of the writing about zero-sum training is written for owners. This post is for coaches. The coaches who will run the format, who will have to coach it before they believe in it, and who will be the difference between a class that means something and a class that doesn't.
I've coached zero-sum classes. I've watched other coaches coach them. Here's what the experience is actually like, week by week.
The first session
You walk in with the format documented. Twelve stations, a 60-second work cycle, a defined room-scoring mechanic. You know the math. You've read the protocol. You've watched a video.
The first three minutes are fine. You brief the class. Athletes nod. They know how to warm up. They know how to set up a station. They've been to a CrossFit class before.
Then the room starts moving, and you realize the format is asking you to watch the room differently than you've ever watched a room.
In a standard class, you watch form. You watch loads. You watch the clock. You're trying to make sure nobody gets hurt and everybody moves. Your attention is on twelve individual athletes doing twelve individual things.
In a zero-sum class, you're watching the room as a room. You're watching who is pushing and who is holding back. You're watching the room's total output as a single number that depends on every athlete. Your attention is on a single entity with twelve parts.
The first session, you'll be slow at this. You'll default to watching form because that's the muscle memory. You'll catch yourself three minutes in and remember: the room is the unit. You'll re-orient. You'll catch yourself again. By the end of the class, you've watched the room in a way you haven't watched a room before. It's exhausting. It's also the most engaged you've been as a coach in years.
The first two weeks
The athletes in the room will sort themselves into three groups within the first two weeks.
The lean-ins. These are the athletes who have been wanting more from the class and didn't have a way to ask for it. They feel the room's outcome depending on their effort within the first session. They ask you about the format after class. They tell you it felt different. They show up the next day. These athletes were already going to stay — you just gave them a reason to be excited about staying.
The neutral. These athletes don't notice the format change in week one. They show up, do the work, leave. By week two, they notice that the room is louder. They notice that people are staying after class more often. They don't have words for what changed. They keep showing up because the class is the same time it always was, and they always go to that class. By week three, they have words.
The pushback. These are the athletes who were getting away with coasting and are now feeling the cost. They don't say "the format changed and now I can't coast." They say "this isn't CrossFit" or "I don't like being scored as a room" or "I'm just here to work out." Some of them are right that the format isn't for them. Most of them are working through the discomfort of being asked to give more.
You will lose some of the pushback athletes. The ones who were on the edge of quitting anyway will use the format change as the reason. That's fine. They were going to leave. The format gave them a clearer reason, which is a cleaner outcome for both of you.
You will keep most of them. The pushback softens by week three when they see the room responding to their effort. The room notices when they push. They notice the room noticing. The discomfort becomes a feeling of being seen.
What changes about the coach's job
Three things change about your job as a coach when you run a zero-sum class.
You stop managing the whiteboard. The whiteboard is still there. Scores are still recorded. But the room's score is the headline, and individual scores are inputs to that headline. You spend less time at the board and more time in the room. This is the change coaches report liking the most. You became a coach because you wanted to coach people, not because you wanted to write numbers on a board.
You have real conversations with athletes. In a standard class, the conversations are mostly about scaling, about form, about injuries. In a zero-sum class, you have conversations about effort. You can say "the room needed more from station four today" and the athlete at station four knows who they are. The conversation is about the room and the athlete's role in it. It's not personal. It's structural. That makes it easier to have, and easier to hear.
You become accountable to the room. Coaches in standard classes are accountable to the owner, to the programming, to the brand. In a zero-sum class, you're also accountable to the room. The room's score is partly a reflection of how well you set up the format, how clearly you briefed, how well you held the standard. Coaches report this being uncomfortable at first and then becoming the most meaningful part of the job.
The athletes who teach you something
In every zero-sum class I've watched, one or two athletes emerge who were previously invisible. They were quiet in the warm-up. They scaled every workout. They left immediately after. In the zero-sum format, their effort matters to the room in a way it didn't before. They start pushing harder. They start staying after class. They start bringing friends.
These are the athletes who were going to quit. They were going to be the loss in your quarterly retention number. They were going to leave, and you wouldn't have known why, because they never complained. They never asked for anything. They just stopped coming.
The format change gave them a reason to stay that they couldn't articulate. They didn't stay because of you. They stayed because of the room, and you were the one who built the room.
Coaches who have had this experience describe it as the reason they got into coaching in the first place. It's the part of the job that justifies all the other parts.
What doesn't change
The athletes still need scaling. The warm-up still matters. The cool-down still matters. The form corrections still happen. You still write programming. You still plan the week. You still show up early and stay late.
The format change doesn't reduce the workload. It changes what the workload is for. The form corrections are in service of the room's output. The scaling is in service of the room's outcome. The warm-up is in service of the room being ready. The work is the same. The work has a point it didn't have before.
When the format fails
The format fails when the coach tries to run it without believing in it. If you think zero-sum is a gimmick and you're running it because the owner told you to, the athletes will feel that within a week. The room will sense that the coach doesn't think the room matters. The room will respond accordingly.
The format also fails when the scoring mechanic is opaque. If the athletes can't compute the room's score in their head while they're working, they can't connect their effort to the outcome. The math has to be transparent. It has to be a number they could call out at any moment.
The format caps the room. Per Core Spec §5, a single session holds up to 24 athletes. Larger rooms need two sessions or split formats — running more than the cap dilutes the connection between an athlete's effort and the room's outcome.
The format fails when the coach treats it as a workout and not as a class. The differences matter. A workout is something you do alone in a room with other people. A class is something you do with other people in a room. The format is a class format. Run it like a class.
What coaches say after three months
I ask coaches who've been running the format for a quarter what changed. Three answers come up most often.
The first is that they like their job more. The job has a point. The athletes are more engaged. The conversations are more real.
The second is that they sleep better on nights before classes. There's less anxiety about whether anyone will show up, about whether the class will be awkward, about whether the athletes are getting what they came for. The format does a lot of the work. The coach's job is to hold the space.
The third is that they quit less. Coach turnover is the silent killer of facility retention. A coach who has been at a facility for two years and who has run the same format for two years starts to wonder if this is the job forever. A coach who is running a format that's producing something new in the room doesn't ask that question. The job is still unfolding.
How to start
If you're a coach reading this and your owner hasn't asked you to run a zero-sum format, ask. If your owner has asked you and you're skeptical, run it for a month before you decide. The first week is weird. The third week is different. The eighth week is the job you got into coaching to do.
If you're an owner reading this and you have a coach you're worried about losing, this is the format that brings them back. Not because the format is magic. Because the format makes the coaching matter in a way the standard format stopped making it matter two years ago.
Read the protocol. Watch how penalty mechanics make the room's outcome feel real. Then run it.