I recently added a new piece of equipment to my dojo. The bag weighs about 70 pounds and supposedly has an extra soft core, but it seems pretty hard when I kick it. Maybe it just needs to be broken in (or I need to strengthen my feet and legs). Hopefully this will be useful to help improve my kicks. The only drawback is hitting the bag makes a fairly loud slapping noise, so I need to use it at times during the day when it is less likely to disturb the neighbors.