1. Muscle Stiffness and Pain: Without stretching, muscles will become tense and stiff, which may lead to discomfort and pain after exercise.

2. Increased risk of injury: Lack of stretching may increase the risk of injury to muscles, tendons and ligaments, especially in high-intensity or high-impact sports, such as running, jumping and weightlifting.

3. Limited range of motion of joints: Without stretching, the range of motion of joints may be limited, thus affecting the flexibility and athletic performance of the body.

4. Muscle imbalance: Without stretching, some muscle groups may become more tense, while others are relatively relaxed, resulting in muscle imbalance.

5. Longer recovery time: Stretching helps to reduce muscle soreness and tension and improve the body's adaptability to exercise. If there is no stretching, the recovery time may be longer.

In order to keep healthy and avoid these consequences, it is recommended to do proper stretching exercise after each fitness.