Fitness Blender

This channel lists hundreds of full-length workouts of every conceivable type, starring the husband-and-wife certified instructor team Daniel and Kelli Segar. All of their content is free with no ads or commercial interruptions. Their channel is closing in on two million subscribers. Videos garner half a million views or more every week.

SO

Acacia TV

Besides its free YouTube postings, brand new upstart Acacia TV offers low-cost, unlimited streaming workouts featuring everything from gentle yoga to high-intensity boot camp. It’s building a steady viewer base thanks to high-quality production and robust community support from its team of certified instructors on Facebook.

Blogilates

Cassey Ho is super cute and she’s also a certified fitness instructor with a degree in biology. With more than two million channel subscribers, viewers flock by the thousands to each of her signature “POP Pilates” video workouts that showcase traditional Pilates moves set to top 40 style tunes.

Zuzkalight

Czech beauty Zuzka Light has attracted more than 300,000 YouTube channel subscribers. Every video this blonde bombshell posts gathers hundreds of thousands of hits, often within hours. She is a certified kettle bell instructor but also leads a wide variety of other workouts.

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