While preparing for my sons' next track and field event, I felt we needed a edge; strength training. First I looked online for vests but found them to be either really expensive or not made for children.
The one's I did find for children were the Sensory Integration weighted vest for kids with D.I.S.(Dysfunction of Sensory Integration), they were expensive ($50-$125), didn't offer enough weight and were just not cute.
So I decided to try and figure out how to make a cheap weight vest whose weight could be adjusted depending on the exercise.
Step 1: First Attempt
My first attempt wasn't bad but the vest was too bulky, the sand shifted to the bottom of the vest and the weight wasn't adjustable.