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If Zuzana's chiseled abs alone aren't enough to inspire you, then you'll love Bodyrock.tv for their creative moves, basic equipment, and short but very intense workouts. The cardio and (mostly) bodyweight circuit workouts are easily adapted to any skill level. Bonus: Unlike many YouTube channels, Freddy shoots high-quality video and Zuzana is great at both explaining and demonstrating.
Video: 10 minutes to a flat stomach!
Frugal Fitness TV
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Michael Schiemer specializes in giving you the best workout for your buck—or in this case, no money at all! Frugal Fitness TV offers a wide selection of at-home strength workouts that require minimal equipment.
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Love Pilates but hate paying for the pricey studio? Cassey Ho of Blogilates offers short, free Pilates videos that can either be done alone to target a specific area or strung together to make a full Pop Pilates workout. You'll love her fun, professional manner.
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Fitness is life for Steve and Bonnie Pfiester, a reality TV trainer and fitness columnist, respectively, who opened Longevity Clubs in California. But even if you live in the frozen wasteland (like I do!), you can still take advantage of their intense, free workouts. My personal favorites are their intense BCx bootcamp videos.
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MyOMy Fitness promises "extreme home fitness workouts," and it delivers with creative kettlebell and body-weight exercises to build strength and burn fat. The cost? Just your sweat.
Scott Herman Fitness
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Scott Herman's wildly popular YouTube channel offers serious advice and seriously hardcore strength workouts. Whether you are looking for a little ab-motivation (his have been featured on the cover of Men's Fitness) or some new moves to try out, you'll find a great selection and community.
Angry Trainer Fitness
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Alfonso Moretti, affectionately known as the Angry Trainer, is tired of personal trainers charging an arm and a leg just to get accurate fitness advice. On his YouTube channel, not only do you get free workouts pulled from his training experience, but you also get valuable fitness advice (and not as much yelling as you'd think!).
Jenny Ford Fitness
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If you love group fitness classes like Zumba and step aerobics but can't afford the gym fees, Jenny Ford posts free, full-length cardio videos filmed and delivered with a professional flare.
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Craig Ballantyne was one of the first fitness professionals to advocate high-intensity training for fat burning, so it's not surprising that his Turbulence Training videos offer a variety of short interval workouts. You can string several workouts together or add one to your normal routine for an extra dose of fat burning.
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Diet.com was named YouTube's #1 health and fitness channel for a reason. With thousands of videos covering everything from healthy eating to body image to free workouts, it's easy to find something that piques your interest.