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High Intensity Interval Training: Burn Fat Faster with 60-Plus High-Impact Exercises (Idiot's Guides): Bartram, Sean: 9781615647477: Amazon.com: Books
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45-Minute HIIT Fitness Class | Advanced Exercises | Core, Legs, and Cardio Strength | For Adults 50+ - YouTube
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Low-intensity interval training can be as effective as HIIT – but only if you spend more time working out
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