Forgiving yourself is another way of giving yourself permission to get out of your own way. To see the truth for what it is, rather than hide behind it. If we take self-forgiveness moments, it changes our perspective, and therefore our approach to life. Our mood lifts, and we return to feeling happy and having that inner calm again.
The confidence I get from exercise is not just vanity. Sure, I like how I look and enjoy making progress, but my the confidence I get runs deeper than that. The better I get at running, the heavier weights I can lift and the further I can push my body reminds me of how to better tackle other challenges outside of my workouts.