Mortality

Per Bruce R. McConkie in "A New Witness for the Articles of Faith" page 81;

The Three Pillars of Eternity

The three greatest events that ever occurred or ever will occur in all eternity are these:

1) The creation of the heavens and earth, of man; and of all forms of life.

2) The fall of man, of all forms of life, and of the earth itself from their primeval state to their present mortal state ; and

3) The infinite and eternal atonement, which ransoms man, all living things, and the earth also, from their fallen state so that the salvation of the earth and of all things may be completed.

These three divine events - three pillars of eternity - are inseparably woven together into one grand tapestry known as the eternal plan of salvation....It brings to pass the immortality and eternal life of man. Salvation is in Christ.

Further from page 87

Properly understood, it becomes apparent that the fall of Adam is one of the greatest blessings ever given of God to mankind. It is the way and the means whereby the spirit children of the Father go forth form their celestial home to gain mortal and then immortal bodies. And it provides the way for the experiences, tests, and trials that prepare the faithful for eternal life. Is it any wonder, then, that Michael himself - who stood next to the Lord Jehovah in power, might, and dominion, when they both dwelt in the presence of the Father - is it any wonder that Michael was the one chosen to come here as Adam to made such a glorious blessings available to the billions of his descendants who should be born on earth.

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So as in the pre-existence; we shout for joy for mortality and all it brings.