What is the result of inadequate warm-ups in sports practice?

Inadequate warm-ups in sports practice lead to a higher likelihood of injuries primarily because the body is not adequately prepared for the physical demands of the activity. A proper warm-up gradually increases the heart rate, enhances blood flow to muscles, improves flexibility, and prepares the nervous system for more intense movements. Without this preparation, muscles may be more susceptible to strains, tears, and other injuries. Additionally, inadequate warm-ups can lead to joint stiffness and reduced coordination, which further increases the risk of accidents and injuries during physical activity.

The other options do not align with the consequences of inadequate warm-ups. Increased performance is unlikely when the body hasn't been prepared, and better injury resistance cannot be achieved without proper warm-up routines. Additionally, while improved flexibility might be a result of effective warm-ups, it is not a direct consequence of not warming up adequately.