Exercise gets expensive quick. Not to worry a little innovation can go a long way.
Step 1: Items you will need
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
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
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.