Genetic Projections
Natural Muscle Potential
Estimate your maximum lean muscle mass potential using the Casey Butt frame-based model, which correlates skeletal thickness (wrist and ankle girth) with muscular ceiling.
Scientific Model
The Casey Butt model is based on detailed measurements of drug-free athletic champions. Unlike height-weight charts (BMI), it accounts directly for your bone structure density, which restricts the amount of muscle mass your frame can structurally carry.