Instructables
Picture of Building Plyometric Boxes (Plyo Boxes)

Plyometric boxes are a fantastic workout tool and are common sight in Crossfit Gyms.  They're quite expensive to purchase but much cheaper to make, and they aren't overly difficult to construct. 

At my gym we've got a number of different boxes, several each of 12", 18", 20" and 24" heights.  One of the other members told me that she wanted to progress past the 12" box she was using, but wasn't quite ready to move to the 18" box, and asked if I could make her a 15" to bridge the gap.  For that reason these instructions will be based on a 15" box, but once you understand the basic construction you can easily make plans for any size that you'd like.

I'm also going to go into depth regarding setting up a workflow that lends itself to churning out multiple units.  The woman that asked for this only wanted one, but as soon as I started working through the layout, I realized I could get four boxes out of a single 4' x 8' sheet of plywood.  (Almost.  I had some plywood laying around that I used to make two of the tops.  Everything else came out of one sheet.) 

The idea, though, is that if you're going to go through the trouble of making one, you might as well make a bunch, because it's only a little more effort.  A lot of the work involves setting up jigs and templates, but once they're done you can just keep cranking them out. 

I should also note that I have a pretty wide array of power tools.  In most cases these just make things easier or faster, but many of them aren't a necessity.  As I work through the instructions I'll try and point out how to adjust things if you don't have everything I do. 

 
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denisemoore2 months ago

That is really cool! Would you mind responding with the dimensions and what I need to buy to make this plyometric boxes? Having to pay for each one of those boxes can cost up to $400...

gabebillings (author)  denisemoore2 months ago

I think I covered all of those items in the instructable. Did you read the entire thing? There's several pages.

djsc1 year ago
this is going on my to-do list. I think I will go for a vertical sided version with a bottom in it, so I can store my small weights, grips, gloves etc inside, the Plyo-box functionality will be a nice bonus.
just need to find a cheap source of ply or make a stupidly heavy one out of scaffolding planks.
cimz2 years ago
Just wanted to say thank you again, figured I would share some pictures of my final boxes.
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gabebillings (author)  cimz2 years ago
Those look pretty sweet. Are they made of particle board?
Double check the materials section - plywood. The screws would rip out of particle board and MDF pretty quick.
I honestly thought the screws would rip out also, but after a year of regular and pretty heavy use, I haven't had a single issue with any of them
I've had such bad luck with partical boar furniture and MDF I wouldn't have risked it; Glad to hear your experience has been more positive!! :-) I could see exterior grade chip board working OK.
Yeah. I thought it was going to be a nightmare but it didn't turn out so bad at all. I honestly couldn't bring myself to shell out the money for 3/4" ply so I settled for the particle board. I also added skid resistant rubber feet to the bottom of them as well. All in all the whole project cost me less than 20 dollars in materials which was a huge plus. I also like that the particle board offers a some extra texture on the top of the landing area.
gabebillings (author)  cimz2 years ago
I'd be curious as to how they hold up under use. I'd be a little leery of particle board in a structural use like this. I didn't think it was quite as strong as plywood would be.
I used roofing grade particle board. I figure, if they use it for roofing, it can't be all bad right? i have a huge camp coming up in a few days, I'll let you know how it holds up after that abuse.
cimz2 years ago
This project was fantastic. I just made one myself and your instructions made the entire job much easier. I was thinking about scaling the project up to make an 18" box for other work outs. The question I have for you is, was the footprint of the 18" box you based this project off of the same as the 15" box? In other words, would my bottom dimension for my panels still be 1'5.75" or should i scale that measurement up?
gabebillings (author)  cimz2 years ago
Prior to me making the 15", our gym had 12", 18", 20", 24" and 36" boxes. Whoever made them designed them so that they'd all nest for easy stacking. Unfortunately there wasn't enough space for me to squeeze something between the 12" and 18", so mine fits under the 18" but not over the 12". So if you were going to build another I'd maintain the same side angle, which means each larger box will have a larger footprint. (If you want them to nest, make sure to leave a little space.)

I would suggest, though, that if you're going to make another box, don't make one of these. The latest ones I made for the gym were a totally different design (swiped from Rogue Fitness) that I think gives you more bang for your buck.

Basically what you do it make a closed-side box such that each dimension gives you a different box height. I made 3 copies of the ones they use at the Crossfit Games (20", 24" and 30") and I also made two that were 18", 20" and 24".

If you're going through the trouble of making one with the angled sides, this isn't any more complex, and it'll give you 3 more heights to play with instead of 1. I was worried that they'd be a little tippy while using the highest heights, but they're really heavy and I use ours all the time with no problems. They're solid as a rock.

I have no idea how Rogue makes theirs, but I tried to figure out how to brace it internally to deal with the stresses. You can see in my pics how I did it. Not sure if that's the best way, but I haven't seen any trace of them breaking down yet. Let me know if you have any further questions.

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Very nice job. Any chance that you could post the plans for the Rouge-type box? This would be great for introducing my kids to CrossFit!
gabebillings (author)  mike_g2 years ago
It might be a while before I can get around to making a full-fledged Instructable, but I think it's probably simple enough to just describe.  Caveat: It's kinda late, and I don't have any drawings I'm going off of.  I'm just re-thinking this up like I did the first time.  So it's entirely possible I'll screw up a measurement.  Work through the logic with me and double check the measurements.  Or you might end up with a funny shaped box.

So let's assume you're going to make a 20" x 24" x 30" box. 

First you'll need a top and bottom.  With mine I chose to make these the 20" x 30" pieces.  (I think I did it this way because when I was trying to figure out how to cut everything out of a sheet this was the most economical.)

If you're sure of your ability to cut things perfectly then you can make these to size.  I cut mine maybe 3/16" over so I had a little overhang.  When everything was assembled, I took a flush cutting bit on the router and trimmed them, running the bearing on the sides of the box.  Otherwise they probably wouldn't have mated up perfectly.

So now you're going to cut two more sides.  These will be full length (30") but have to be a 1.5" shorter to account for being sandwiched between the top and bottom.  So they're 22.5" x 30". 

You could make a hollow box shape now by setting the top and bottom on the edge pieces you just cut.  It'd be 24" tall (22.5" plus .75" for each top and bottom) and 30" long.

Now you need some side pieces, plus one more for internal bracing.  This FACE will be 20" x 24", but that includes all four edges you need to account for.  So your piece needs to be 18.5" x 22.5". 

I also added two more pieces to complete the cross section you see in the last picture above.  These are tougher to measure perfectly ahead of time.  3/4" plywood isn't exactly 3/4", it's like 22/32".  So the box will be a hair off exact dimension when finished.  But if you try to precut those last two supports they'll be a little loose.  So wait until you dry fit everything, then measure and cut those pieces.

You might be able to get away without them.  I would guess the Rogue boxes don't use them.  (The next time I see one I'll peek through the handhold and see.)  But I asked myself how the box would hold up if it were being jumped on. 

At the 24" height, the platform you're jumping on is supported by all four sides as well as the crosspiece in the center.  Bombproof.  You could probably set a car on that.  At the 20" height, you're directly supported by the edges of the three matching internal pieces as well as whatever mechanical holding devices are keeping the top and bottom on.  (Screws, nails, glue, etc.)  Still pretty solid.  The ends were what I was worried about.

Without those last 2 internal pieces, the ends are being held in place entirely by mechanical fasteners.  There are no edge-on pieces of plywood to help transfer the forces down to the ground.  So I put those last 2 pieces in there to do just that.

It might have been fine without, but I don't want something I built falling apart when someone is using it. 

I used pocket screws on my box on pretty much everything I could reach.  If you do that, think ahead to how big your drill/driver is and how much space there will be once things start going together.  I have a pretty small Bosch driver, and it was still too big for some of the tight spots.  I hadn't thought it through and might have gotten around that if I could have put the entire internal cross section together first and then slid it into the sides.  If you do this, you'll still end up with at least one piece, probably the top or the bottom, that you obviously won't be able to use pocket screws on.  Unless you have a really small monkey that can operate the driver and crawl out through the handhold when he's done.  I just nailed the last side on.  And use plenty of glue.  Glue + mechanical fasteners = good.

When these are done I think they're close to if not over a full sheet of plywood, so they're pretty darn heavy.  They're far more stable than I would have thought.
Excellent, thanks for the tips. I appreciate your response. Have a great day!

Mike
Thank you so much for getting back to me so promptly, I greatly appreciate it. This idea is definitely a much more simple, and practical solution for sure. Although I'd love to make this for personal use, I think making separate ones for now is my best option. I run a baseball/fitness camp and storage space is a huge issue. The ability to stack the pyramid shaped ones would probably be the best route for me right now. Thank you again so much for all your insight and for creating this really wonderful and informative instructable.
dwestman3 years ago
Nice project! Did you need to reenforce the inside corners to keep the sides from splaying apart?
gabebillings (author)  dwestman3 years ago
Nope. The combination of glue, screws and biscuits are pretty much bombproof. Even without the biscuits I think the boxes would be plenty strong. The angle is so shallow that the majority of the force on the top is still mostly downwards. If the angle was more like 45 degrees then I'd worry about them ripping apart, but as it is I have no fears.
BeanGolem3 years ago
If you make more than one, perhaps adding small felt pieces to the vertical (angled) sides on the inside corners could help prevent damage when you stack them.
I was thinking you could use those felt pads with a sticky back made for the bottom of Chess pieces.
mary candy3 years ago
very nice. I'm going try to make one.. but my tools are sooo simple.. :(
It isn't a real fancy project. I made my Mother a box shaped footstool to put under her typerwriter one Christmas, and I used a tablesaw, a hole saw, a keyhole saw, a pocket hole joiner, a carpenter's square, a router, a box joint jig, sandpaper, and Bob's your Uncle!
gabebillings (author)  mary candy3 years ago
Sweet! Give it a shot! The only thing I think is really critical is having a decent straight edge. If you've got that, and you can make your saw track a straight line, you should be ok. Good luck!
These also work great for stage and film applications. they just need to be painted black. At the auditorium where I work, we call these 'rock boxes.'
gabebillings (author) 3 years ago
I just realized that my big rolling worktable was on a door, too. Yeah, doors are pretty awesome at being big and flat. I threw a piece of 3/4" melamine on top of it as well, which is great because the wood glue doesn't stick. Unlike the Gorilla Glue. Sigh.
seamster3 years ago
These are very nice. I got a kick out of your short worktable made from an old door... it looks a lot like mine! You know what they say, great minds...
gabebillings (author)  seamster3 years ago
Thanks. My workshop is my garage, and I make sure that I can still fit two cars in there, so everything has to fit into maybe the outer 3'-4' edge of the space. I tend to use a lot of table space, so I've got two folding tables I whip out a lot, and I've had that door lying around for years, and it often gets thrown onto sawhorses and turned into a table as well. You can never have too many clamps, or table space.