To effectively improve flexibility, what practice should be avoided?

Avoiding stretching cold muscles is crucial for effectively improving flexibility. When muscles are cold, they are less pliable and more prone to injury, such as strains or tears. Proper warm-up exercises increase blood flow and raise the muscle temperature, making them more elastic and ready for stretching. By ensuring that muscles are warmed up, you can achieve a greater range of motion and reduce the risk of injury. The other practices, like regular warm-up routines, participating in yoga classes, and using foam rollers, actually support the enhancement of flexibility and muscle health, making them beneficial rather than detrimental.