Final Answer:
The statement "To prevent a loss of flexibility, you must stretch after a weight-training workout." is False because it helps in maintaining flexibility by aiding muscle recovery.
Step-by-step explanation:
Stretching after weight-training doesn't necessarily prevent a loss of flexibility, but it plays a crucial role in aiding muscle recovery and potentially enhancing flexibility.
While weight-training can increase muscle mass and strength, it often leads to muscles contracting and shortening, potentially reducing flexibility if not counteracted. Stretching post-workout helps relax and elongate muscles, counteracting the shortening effect caused by weightlifting. This aids in maintaining or improving flexibility over time.
However, it's important to note that simply stretching after weight-training might not fully prevent a loss of flexibility if it's not complemented by consistent stretching routines and mobility exercises. Thus, while stretching after a workout is beneficial, a comprehensive approach including regular stretching outside of workouts is essential for maintaining or improving flexibility in the long run.