ninja line: the line your garden has been missing
We make the line and everything that hangs off it. Put two straps up between a pair of healthy trees, clip the obstacles wherever you want them, and the garden stops being a lawn for the rest of the summer.
Two things worth knowing
How the run works
Nothing on the strap is bolted down
Every ring, bar, ladder and fist rides on a carabiner that slides. Crowd them together and the run becomes a grip test; spread them out and a five-year-old can cross the whole thing without stopping. We never print a recommended order, because the order is the game.
The low strap is the one they keep coming back to
Both of our kits ship with a second line that carries no obstacles at all. It sits near the grass and does nothing but wobble. It looks like the boring half of the kit, and it is the half that gets used on an ordinary Tuesday.
Top of the line
Everything we make
Five things: two complete kits, one add-on for a line you already own, and a pair of indoor oddments for hands that will not sit still.
The 14-Station Line, 2x65 ft
Our long run: two 65-foot straps and fourteen places to hang, swing or haul yourself up.
The 10-Station Line, 2x56 ft
Ten obstacles on two 56-foot straps — the kit most yards actually have room for.
Climbing Cargo Net and Rope Ladder
A yellow webbing net that turns any beam, branch or line into a climb.
Clear Acrylic Mahjong Racks with Pushers, 4-Pack
Four assembled racks with built-in pushers, clear enough to disappear under the tiles.
Butter Stick Squishy Toys, 2-Pack
Two slow-rising sticks — one red swirl, one blue — for hands with nothing to hang from.
The shelves
Pick where to start
Complete lines
Between Two Trees
A line is two straps, two ratchets and a row of things to hang from. Pick the length that fits the gap in your yard and the number of stations you want swinging on it.
Single obstacles
Add A Station
One more thing to climb, and the whole run changes. These clip onto a line you already own, or onto a beam, a branch or a frame.
Indoor hand play
Off The Line
Rain, dusk, a long car ride. We make a couple of things for hands that are still busy when the straps are coiled in the bag.
The 10-Station Line, 2x56 ft
Fifty-six feet is the length that fits a normal garden, and ten stations is the number that still leaves room to swing between them.
Climbing Cargo Net and Rope Ladder
A net is the one obstacle that makes children queue.
Out of our own garden
A summer on the strap
Written by the people who rigged it
Six write-ups from the gardens it went up in
Every word below came from somebody who actually strung one of these between two trees, typos and all.
★★★★★
Wonderful for Multiple Ages
I have five kids ranging from 1 to 8 years old. I bought this for them to have another activity outside. All of my kids love to climb and are very active. And they all LOVE this ninja course. I installed this by myself. It took me a little while to put together but I was able to figure it out. Definitely would be easier to put together with two adults. It seems very sturdy and holds all of my kids very well. My kids have hours of fun on this and play on it every day. I definitely would recommend if you have room for this in your yard. I’m very happy with my purchase.
★★★★★
Great way to keep kids active! Very well built.
Absolutely love. Got for a Christmas gift and it is such a good value for the money. Very easy to install with two people. The pieces and straps are built very well and sit has been a hit for all the kids. I like that you can add pieces if you have a long run which makes it very functional. Fun for all kids!
★★★★★
Tough and durable
Great slack line. All obstacles have lasted well against weather and crowds of kids playing on them. If there was a bad thing to mention it is that where the base slack line touches and wears on the trees it will eventually cut through the slack line and break. Ive bought 2 slack lines in the past year. Just ve sure to use the cover that hugs the tree to reduce friction and wear
★★★★★
Clear Acrylic Looks Beautiful
The transparent acrylic design is my favorite part. These racks have a clean, modern look and match well with different Mahjong mats and tables. They feel lightweight but stable, and the non-slip pads help keep them from moving around while playing.
★★★★☆
More unique than your typical butter squishie.
Squishies are ALL the rage right now! My kids are constantly collecting and trading these, so I wanted to get them something unique. I like these variations because they are basically stress balls, the kids just don't know it. These are made of a foam like material instead of those water / gel filled ones that kids are getting hurt with. These are VERY slow rise, if you are impatient, it can be almost annoying how very slow these are so just keep that in mind. I wouldn't say that necessarily a bad thing it just depends on what you, personally, are looking for. Overall I like them, decent value, great for kids or adults.
★★★★★
FUN
Colorful and fun to squish! My students enjoyed it before handwriting tasks.
Asked at the fence
Questions we get asked over the fence
How much weight can a ninja line hold?
Both of our kits are built around 880 lb hardware — alloy steel components with an anti-rust finish, and polyester webbing rated to match. That number is not about adults joining in. A child who drops onto a ring pulls several times their own weight for a fraction of a second, and the margin is there to absorb it.
How do you hang a ninja line without trees?
Any two solid, immovable uprights will do: 4x4 posts set in concrete, the corner posts of a sturdy swing frame, a carport beam. What matters is that the anchor cannot lean. Fences, washing lines and single-skin sheds are not anchors — a tensioned strap pulls far harder sideways than people expect.
What is a ninja slackline?
It is the same idea borrowed from slacklining: a flat webbing strap tensioned with a ratchet. The difference is what goes on it. A slackline is for walking; a ninja line carries obstacles, so it is hung higher and used hand over hand instead of underfoot.
Is slacklining still a thing?
In backyards, more than ever. The walking line never went away, but it picked up a second life once people started hanging rings and bars from it. Most of the families we hear from bought the kit for the obstacles and ended up using the balance strap just as much.
Before you buy anything
Picking your two anchors for a backyard ninja warrior obstacle course
Where the line goes decides how good the course is. Here is how we choose a span.
Setting the run
The order of the obstacles
Ten pieces, one strap, and no instructions. Four layouts we keep going back to.
Taking it down
When the season turns
Webbing dies slowly and invisibly. Twenty minutes in autumn buys you another summer.
What a ninja line actually is
A ninja line is a strap you tension between two anchors so that kids have something overhead to hang from. Ours goes up in a backyard in about ten minutes: two trees, two ratchets, and a row of rings, bars and a rope ladder clipped along the top. Nothing is fixed, so the course changes shape every week and the fun does not run out in August.
We started making this because our own children had worn a path around the sofa. Outdoor life gets easier when there is a swing at head height and a line to cross, and a strap between two trees is the cheapest way we know to put one there.
Pick the gap in your garden, pick the length that fits it, and let the rest be worked out by whoever is hanging upside down at the time.