This gentleman might have a solution.
A punching bag is a sturdy bag designed to be repeatedly punched. The bag is usually cylindrical, and filled with various materials of corresponding hardness.
Punching bags are used in martial arts and combat sports such as Boxing, Karate, Taekwondo, and Muay Thai for practicing kicking and striking to improve technique and enhance endurance.
- The demonstrator, MrHerbalincense, stated the bag (in the video) was around medium firmness using cracked corn as a filler. Beginners are recommended to use cracked corn.
- Playground sand can be used as a filler as well but the demonstrator advises fighters who choose this option to be careful because its like hitting a rock.