No Expansion Packs Needed:
A*: Master the athletic skill and complete all of the skill challenges.
A: Master the athletic skill and complete most of the skill challenges.
A-: Master the athletic skill and complete some of the skill challenges.
B+: Master the athletic skill and complete one of the skill challenges.
B: Master the athletic skill.
B-: Reach level 9 of the athletic skill.
C+: Reach level 8 of the athletic skill.
C: Reach level 7 of the athletic skill.
C-: Reach level 6 of the athletic skill.
D+: Reach level 5 of the athletic skill.
D: Reach level 4 of the athletic skill.
D-: Reach level 3 of the athletic skill.
F: Reach level 2 of the athletic skill or less.
A: Master the athletic skill and complete most of the skill challenges.
A-: Master the athletic skill and complete some of the skill challenges.
B+: Master the athletic skill and complete one of the skill challenges.
B: Master the athletic skill.
B-: Reach level 9 of the athletic skill.
C+: Reach level 8 of the athletic skill.
C: Reach level 7 of the athletic skill.
C-: Reach level 6 of the athletic skill.
D+: Reach level 5 of the athletic skill.
D: Reach level 4 of the athletic skill.
D-: Reach level 3 of the athletic skill.
F: Reach level 2 of the athletic skill or less.