Every athlete and coach has heard someone say, “This team just has chemistry.” It sounds like luck, as if some groups click and others don't. Sport psychology research suggests there is more to it than that, and that much of what we call chemistry can be built on purpose.

What cohesion actually is

Researchers define cohesion as the tendency of a team to stick together while pursuing its goals and meeting its members' emotional needs. That definition can be divided into two halves:

Task cohesion is how united the team is around what it is trying to achieve. It looks like “Do we agree on the goals? Do I accept my role and believe in our tactics?”

Social cohesion is about relationships. It means “Do teammates like each other? Do I feel included and valued as a person, not just as a player?”

A team can be strong on one and weak on the other. A team of professionals with no personal bonds can feel cold. A team of best friends with no shared standards can drift apart. The healthiest teams have both.

Why it matters: Cohesion changes how athletes handle pressure

Competition is stressful for everyone. What separates athletes from one another is how they interpret that stress.

A 2025 study in the Journal of Applied Sport Psychology tested this using competition scenarios. Athletes who imagined being on a highly cohesive team felt more supported. They saw the upcoming competition as more of a challenge than a threat, and they responded with more excitement. The chain flows like this: cohesion raises the sense of available support, which raises confidence in one's own ability, which improves the sense of being able to cope, which produces excitement. The researchers highlighted social bonds as especially important. The study did not find that cohesion reduced anxiety, so the claim is that cohesive teams help athletes feel more excited, not necessarily less nervous.

Other research points the same way. A Spanish study of developing athletes linked cohesion to positive self-talk and self-confidence, both of which matter when things go wrong mid-game.

How it's built

1. Leadership sets the tone. A study of 196 Korean athletes across baseball, judo, soccer, taekwondo and hockey found that coaches who practise transformational leadership had a positive effect on team norms and team cohesion. These are coaches who communicate a clear vision, inspire belief in it and recognise individual contributions. Norms also mattered directly: the clearer and more shared the team's unwritten rules, the stronger the cohesion.

2. Shared goals, clear roles. Sport Information Resource Centre (SIRC) coaching guidance suggests letting athletes help set team goals so they own them, and writing a team contract that spells out acceptable and unacceptable behaviour, such as being on time. Coaches should also meet athletes one-on-one to make sure they understand and accept their roles, and give individual feedback so everyone can see how they contribute.

3. Rituals and relationships. On the social side, SIRC recommends team dinners and game nights, and creating cheers, mantras or inclusive uniforms. They also suggest unique handshakes between teammates and having leaders learn something personal about each person, such as a hobby. These small acts build belonging, which is the foundation of social cohesion.

4. The athlete's own mindset. The Spanish study found that athletes who preferred working as part of a group and had strong social bonds reported the best self-talk and confidence. The authors also note that cohesion can be trained. It is a skill a team develops, not a trait it is born with.

The Twist: More isn't always better

It is tempting to assume that more cohesion means more stability in the group. The research says otherwise.

Tight groups can produce pressure to conform, and dissenting voices can get ignored. A team that obsesses over task cohesion alone can end up with more pressure, less enjoyment and weaker relationships. A team that focuses only on being close can lose sight of its goals or quietly isolate members who don't fit in.

The takeaway is not to avoid cohesion. The benefits generally outweigh the risks. The point is to keep task and social cohesion in balance.

Cohesion in individual sports

You might assume cohesion matters only in team sports. The Korean study compared individual and team-sport athletes and found that individual-sport athletes reported somewhat higher cohesion. Judo and taekwondo athletes still train, travel and compete as part of a squad, and the sense of belonging seems to matter there too. If you coach or compete in an individual sport, your training group is a team.

Takeaways for coaches and captains

Build both sides. Pair goal-setting and role clarity with real social time is noted to be important.

Let athletes co-create the rules. When people create their own rules and norms, they tend to defend them better than when they are instructed to do so.

Know your athletes as people. A five-minute personal conversation with each athlete on a weekly basis counts for more than it seems. It also helps the athletes resonate better with their coaches allowing for less impersonal relationships.

Watch for the shadow side. Check that quieter voices in the team are also heard and that closeness isn't crowding out standards.

Treat cohesion as trainable. It doesn't just happen overnight or naturally. It is built through repeated, deliberate habits and efforts from all the sides. The next time you see a teammate give someone a high-five, hold a check-in meeting or plan a team dinner, you're watching cohesion being built.