Fitness research

Sourced fitness benchmarks for better operations

Each brief leads with a liftable statistic, a clear table, and direct links to public sources.

Member wellbeing evidence

Sleep-duration research as a boundary for fitness recovery content

7 to 9 hours is an adult recommendation range

A bounded, source-led examination of sleep-duration research as a boundary for fitness recovery content, including measurement method, evidence limits, and practical record boundaries.