Final answer:
Positive affirmations serve as a reminder of strengths during times of stress and doubt.
Step-by-step explanation:
The strategy that serves as a reminder of strengths during times of stress and doubt is positive affirmations. Positive affirmations involve repeating positive statements about oneself to counter negative self-talk and boost self-confidence. For example, saying affirmations like 'I am capable' or 'I can overcome challenges' can help shift one's mindset and provide a sense of hope and resilience during stressful situations.
Other strategies mentioned, such as meditation, exercise, and journaling, can also be beneficial for managing stress and promoting well-being. However, when it comes to serving as a reminder of strengths, positive affirmations specifically focus on building self-confidence and self-belief.