Class 41 - Spiritual Strength

We all know the importance of physical exercise and diet for our physical fitness. We all know it is important to be mindful, to be aware of the thoughts we are thinking and to try and be more positive mentally. But real spiritual strength is something we generally do not understand. We see inspirational people who seem able to, no matter what the calamity, sail through with calmness and equanimity, even taking such events as lessons or blessings. They seem strong, serene in their certainty, powerful in their sureness.How do we become strong, what muscles need to be exercised for us to be spiritually tough?