For manual balance you need balance in other areas. In terms of physicality this is an inherited trait, and therefore a genetic component of every manual skater. Studying Joey Brezinski in depth I noted that he has an estimated height of 5'10" and a weight of approx 70kg. To assess his balance lets apply the golden rato, which applies mathematical theory to proportion and balance.

The Golden Ratio Theory of Manual Skateboarding
Elite manual skaters like Joey Brezinski may possess a genetic advantage rooted in golden ratio body proportions (φ = 1.618:1).
The Evidence:
Joey Brezinski stands 5'10" (177.8cm) and weighs 70kg - measurements that create near-perfect golden ratio proportions:
- His navel height (~110cm) divides his body at approximately 1.618:1
- This places his center of gravity at the mathematically optimal point for two-wheel balance
Manual tricks require sustained balance on two wheels - an act of continuous mathematical recalibration. Skaters whose bodies naturally conform to golden ratio proportions enjoy inherent advantages:
1. Optimal leverage: Center of mass positioned at the golden mean creates ideal weight distribution
2. Efficient adjustments: Proportional limb lengths allow faster, more precise corrections
3. Reduced effort: Natural balance of proportion and limb length requires less muscular compensation
Most world-class manual specialists share similar characteristics. OF COURSE...you still need to practice to become elite, but those skaters with a genetic advantage might need to proactice for e.g. 5,000 hours to achieve what would take a less physically/genetically advantaged skater 10,000 hours or more.