Here is a boxing speed bag that helps you work on your agility and reaction speed. The SPARBAR PRO 6X is a standing boxing speed bag with a height adjustable stand. Its workout punch ball is made of leather. It uses high impact motion bearings for a fluid motion.
The SPARBAR PRO 6X has a 50lb base filled with sand and water. You can use this to build punching speed, slip, and do aerobic fitness workouts.