Preventive measures for overexertion during workouts include implementing appropriate warm-up and cool-down routines, recognizing personal fitness levels, and listening to your body. Hydration is crucial to prevent fatigue and dehydration. Gradually increasing workout intensity and duration can help avoid injuries related to overtraining. Additionally, incorporating recovery days allows for muscle repair and prevents burnout. Monitoring heart rate during exercise can also assist in understanding limits and detecting signs of overexertion early, contributing to a safer workout experience.