Instructables
Picture of How to Make Your Own Medicine Ball
Exercise gets expensive quick.  Not to worry a little innovation can go a long way.
 
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Step 1: Items you will need

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As with all things, there is certainly more than one way to do things.  Here you will notice I have an old basketball I picked up at a yard sale for 10 cents, play sand, funnel, scissors, rubber cement, shop towels and patches.

There are a few different acceptable ways to seal the ball.  I will go over the method I used and why I chose to do it.

Step 2: Make a hole in the ball

Picture of Make a hole in the ball
I put an air nozzle in the ball to drain the air.  I then chose to puncture the ball with a scissors.  The object here is to make a hole large enough to get your funnel in but not too large that you will have difficulty sealing it.

Step 3: Insert funnel and fill your ball

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I used a small funnel.  If I had a larger one I most definitely would have used it.  Once your funnel is inserted you can begin to add your filler.  I wanted a pretty heavy medicine ball to work with so I chose play sand as my filler.  I have also made them with pea gravel and rubber mulch.  The various fillers will of course give you different weight combinations.  I have also combined fillers for in between weights on different items I have made for my garage gym.

It takes a little time and patience to get all of the sand into your ball. 
icooper29 months ago
Made one following your instructions. The only probs I had, was with the slime. When I used the puncture repair kit the slime kept oozing out of the hole causing the patch not to stick. What I did after that was gaffer tape the whole ball!! Jobs a good un!
Broberg3 years ago
After pricing medicine balls and seeing how easy I could make one, I had to try it.

I got a free basketball from the local National Guard recruiter and then set out to gather the rest of the materials from local hardware store and dollar store and went to work.

I suggest that if you use a new ball like I did to smooth off the area you are going to fill so the patch fits on a smoother surface but other than that it worked just as the Instructable said.

My ball ended up being 25# right on the nose without even trying!

Thanks again!