A heavy bag of sand is actually a pretty good functional workout tool. It mimics dead weight that is not one rigid mass, like a body, or a heavy pack. It's been a thing for more military oriented fitness programs for years. Moving it to a new house still filled with sand is just dumb though.
A heavy bag of sand is actually a pretty good functional workout tool. It mimics dead weight that is not one rigid mass, like a body, or a heavy pack. It's been a thing for more military oriented fitness programs for years. Moving it to a new house still filled with sand is just dumb though.
Free-range organic sand ain't cheap.
Yeah but for sprinting? That sounds terrible.