The 1st thing to consider is size of the sand. If you are doing the internal bags which would be contained inside a duffel bag, the bag sizes will be based on the class of sand you utilize. Really fine sand has less amount of air space than big sand, and a given volume of it is therefore denser and a lot heavier. A small bag of fine sand will weigh the same as an obviously bigger bag of sand that is less fine. If you have a large duffel bag, then you may want coarser sand so that more of the interior is filled with bags of this substance.
However, fine sand (surmising that space is left in the bag, with around 25% empty space being optimal usually), tends to make a floppier bag too. For the reason that it makes use of less area, fine sand can make a denser "center of mass". More of it could fit into a small area, which means that training sandbags with bags of fine sand inside them will possibly be more challenging than those with coarse sand, since you'll be dealing with the shifting of a more dense weight.
The density with which you pack the sand within the individual internal bags, plus the amount of space these bags use inside the duffel, would both have an essential effect on how the sandbag functions. You more often than not don't want extremely tight packing. In both cases, this will make the sandbag far more firm and less able to offer you the all-round exercise it is expected to do. But then, it is also probable for the sandbag to be very loosely packed, in which case it will become nearly impossible to handle because it will simply wrap around your arms and flail freely towards the floor, regardless of position.
A slender, long sandbag tends to be somewhat simpler to deal with than a tighter one, since it is simpler to maneuver it by draping. You are typically not looking for lack in difficulty in handling, of course - it is the very instability and awkwardness of the training sandbag which makes it so useful for developing your entire muscle group and leaving no weak points in your general level of fitness and health.
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