Let's rule out the problem of contact surface first. In fact, there are two options for hitting the contact surface of sandbags. One is to use the middle finger as the contact surface, and the other is to use the middle finger, ring finger and little finger as the contact surface. Most people will choose middle finger, ring finger and little finger. This plane has a larger area and better tolerance. Judging from the pain in your little finger, you are also using this contact surface. Take a closer look at the way you hold your fist. If you hold it too tightly, the three knuckles will be on an inclined plane, so all the strength will be concentrated on one knuckle of the little finger when hitting the sandbag, and it is not surprising that the little finger joint is easy to be injured. When punching sandbags, the three knuckles should be on the same plane. Doing push-ups with your fist can help you understand the posture of your fist when you hit it, which is exactly the same as the fist you hold on the ground. The fist touching the ground is the contact part between the fist and the sandbag. At the same time, push-ups with fists on the ground also help to increase the hardness of your knuckles and help to hit sandbags.

If you are hard enough on yourself, you can hit sandbags without bandages and gloves. After a few years, you will practice a pair of "iron fists" and your knuckles will become thick and strong. At the same time, a small muscle will grow between the little finger and the ring finger of the back of the hand when making a fist. Is this the muscle only used by sandbags to increase the control of the little finger joint? But it should be noted that the wrist must be propped up. Many people who hit sandbags hurt their wrists instead of their knuckles. More sandbags can improve the hardness of knuckles, but not wrists. Sometimes poking your wrist can't be recovered for months.