1. Level of Activity
   1. Training
      1. Techniques
      2. Quality of Coach
   2. Preferences
      1. Youth Sports
2. Genetics
   1. Physical Growth
      1. Size & Strength
      2. Neuromuscular Development
         1. Coordination
         2. Proprioception
   2. Cognitive Development
      1. Understanding of Rules
         1. Stratagize
      2. Anticipation
3. Resources
   1. Economic Status
4. Environment
   1. Climate
   2. Home/Family
      1. Activity level of Sibling/Parent
      2. Diet
   3. School
      1. Phys. Ed. Programs
      2. Intramural Sports