Try this simple math problem at home:







Concrete + recycling bin = a set of 10 pound ishi sashi/ergonomic dumbbells

Use like stone or metal ishi sashi. The handles on the coffee can are perfect for sliding the fingers into, so you can work on finger/hand strength, catches, pinch grips, sanchin conditioning, etc. When puring the concrete, make sure the inner hollow  of the handles gets filled  for a stronger sashi and more weight.  Putting a piece of rolled up hardware cloth or chicken wire in the center of the container before pouring the concrete in will keep the concrete from cracking over time. Depending on how far you fill it, you’ll get a 9-1o lb. sashi.