What can cause a knee to suddenly lock and not fully straighten?

A displaced fragment from a meniscus tear can block joint movement, although other injuries inside the knee may also cause this problem. A truly locked knee should be assessed promptly.

Can insufficient sleep increase sports injury risk and slow recovery?

Insufficient sleep can reduce reaction speed, attention, and movement control and can interfere with muscle repair, pain regulation, and recovery after training. Athletes should keep a regular schedule and allow enough sleep for their training load. Persistent insomnia, marked daytime sleepiness, or snoring with pauses in breathing warrants assessment.

Should athletes use static stretching or a dynamic warm-up before exercise?

Begin with 5 to 10 minutes of low-intensity activity, followed by a sport-specific dynamic warm-up such as high knees, lunges, leg swings, and progressive accelerations. Longer static stretches are generally better placed after training or in a separate flexibility session.