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Perimeter

Everyone lies on their back against a wall, legs up, and passes a yoga ball down the line using only their feet — the second the ball's gone, the passer's up and sprinting to the back of the line. It works because balancing a ball on your shins only holds up if the whole line moves at the same pace, not just the person touching the ball.

15–30 min8–15 peopleAverageYoga ballIn-person onlyClassroom ✓
By Jon Zajac · Founder & Chief Icebreaker · Last updated February 19, 2024

What is Perimeter?

Perimeter lines a group up on their backs against a wall, legs propped up and feet toward the ceiling, then asks them to move a yoga ball down the line using only their feet. Each player passes the ball to the next, then gets up and sprints to the back of the line to become the new tail — so the chain keeps reshuffling even as the ball keeps moving toward the far wall. The round ends when the ball makes it all the way from one end of the room to the other.

It works because balancing a ball on your shins is a two-person problem, not a one-person skill — pass it too fast or too slow and it rolls off before the next player's in position. Add the constant reshuffling as each passer runs to the back, and the whole line ends up reading pace off each other, not just the ball. Split bigger groups into teams racing from opposite walls, and that same coordination turns into a straightforward contest.

It needs real floor space and a wall long enough for the whole line to lie against, so skip it for a tight conference room, a video call, or a group that isn't up for lying down together in public. The tips on softer surfaces and different ball sizes open it up to more players once you've got the room.

The rules

  1. Everyone lies in a single-file line with legs propped against the wall, feet toward the ceiling.
  2. Place the yoga ball on the first player's legs; they move it toward the next player using only their feet.
  3. The moment a player passes the ball on, they get up and run to the back of the line to become the new tail.
  4. Keep passing and running to the back until the ball reaches the far wall.
  5. The round ends when the group gets the ball all the way from one wall to the other.
  6. For bigger groups, split into teams at opposite walls and race — first team to the far side wins.

Before you start

  • Group size: 8–15 players. That's one line's worth. A bigger crowd just means splitting into multiple lines and racing them side by side.
  • One yoga ball, one sturdy wall. The ball travels the whole line, and the wall is what everyone's legs prop against — no wall, no game.
  • Mark a starting and finishing point. Pick both ends of the room before anyone lies down, so there's no argument later about whether the ball actually made it across.
  • Age check. Works for anyone age 10 and up.

How to run it

  1. Gather your group and the ball 2–3 min

    Confirm you've got a yoga ball and a wall with enough floor space for the whole group to lie down in a line, legs propped up.

  2. Get everyone into position 2–3 min

    Line the group up against the wall, legs propped up and feet toward the ceiling. The ball starts at one end of the line and finishes at the other.

  3. Start the ball moving 1 min

    Place the ball on the first player's legs and have them move it to the next player using only their feet — no hands.

  4. Pass, then run to the back 15–30 sec each

    Once a player passes the ball on, they get up and run to the back of the line to become the new tail, keeping the chain moving toward the far wall.

  5. Keep the chain going 5–10 min

    Repeat the pass-then-run pattern until the ball has traveled all the way from one wall to the other.

  6. Make it a race (optional) 5–10 min · optional

    For bigger groups, split into teams starting at opposite walls. Both teams move their ball at the same time; whichever team gets theirs across first wins.

← nobody stays at the back of the line for long.

Facilitator tips

Play it on a softer surfaceGrass or carpet cuts down on the risk of a knock or a fall while players are lying down and running through the line.
Offer more than one ball sizeA couple of yoga ball sizes let players with different reach and comfort levels stay in the line instead of sitting out.
Say the pass-and-run rule once, clearlyEveryone needs to hear "feet only, then run to the back" the same way — say it before the first ball moves, not partway through the line.
Have a lower-contact option readyNot everyone wants to lie on the floor in a line with strangers. Keep an alternative on hand for anyone who'd rather sit this one out.

Why it works

Balance, no faking itThe ball sits on your shins, not your hands — pass it too fast or too slow and it rolls off before the next player's in position. That's an immediate, physical check on whether the line is actually in sync.
Every pass is also a sprintThe instant you pass the ball, you're up and running to the back of the line — so nobody just lies there watching, and the whole chain keeps moving the entire round.
Trust, one leg at a timeYou can't see the ball land on your own legs — you feel it arrive and trust the player before you got the timing right. That's a small, physical trust exercise built into the mechanic itself.
HELLO, MY NAME ISJon

"I like this one because it needs almost nothing — a yoga ball, a wall, and a group willing to lie down together. Splitting bigger groups into teams adds real stakes without changing a single rule. It's good exercise wearing an icebreaker's clothes, and it gets a room paying attention to each other's feet, of all things."

Jon Zajac · Founder & Chief Icebreaker

Reflection questions

For classrooms and teams that want the debrief — these turn a floor full of legs and a rolling ball into an actual conversation.

  1. What did you find most challenging about playing Perimeter?Surfaces which part actually gave the group trouble — balance, communication, or just the timing of the run to the back.
  2. How did you feel working with a new group of people during the game?Gets at how comfortable people felt building trust with people they'd just met, in a game that runs on trusting your neighbor's timing.
  3. What strategies did your team use to move the ball from one end of the room to the other?Turns the pass-and-run choreography into an actual strategy conversation instead of just a recap.
  4. How could playing Perimeter benefit your group outside of this activity?Bridges the balance-and-coordination skills back to how the team moves together day to day.
  5. What did you enjoy most, and would you try a similarly active game again?A quick temperature check on whether an active game like this earns a repeat slot.

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Jon Zajac

Founder & Chief Icebreaker

I started IcebreakerSpot because I believe strong connections are the foundation of successful teams. This site exists to make it easy to find and share the icebreakers and team-building activities that build trust, spark collaboration, and help groups do great things together.

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