Sidney Cummings Houdyshell

The most underrated fitness creator on this list — 1.5M subscribers who follow Sidney's daily workout uploads that span every format from 20-minute strength training to yoga flows to postpartum recovery. What sets her apart: every workout is free with no app upsell, available same-day, and filmed in real-time with no editing tricks. The daily frequency (365 workouts per year, consistently) builds a habit that other channels can't match. Her "Serious Strength" series is among the best intermediate lifting programming freely available anywhere.