The season of Lent is not first about fasting or self-denial; it's about serious participation -- here and now -- in God's divine forgiveness with all his people, from the heart: God's pardon of us and our pardon of others. It doesn't change God, it changes us. It changes our hearts.
In order to realize spiritual epiphanies, sometimes we need to immerse ourselves in self-inflicted agonizing torment. If one can establish a disciplined regimen following P90X or Insanity, interval-training for the soul is definitely manageable.