Beginner-Friendly HIIT at-Home Workout You won’t need any equipment for this quick floor workout, designed to be simple enough for a beginner and challenging enough for veteran exercisers. Using short intervals and simple bodyweight exercises, this HIIT workout will help you burn fat and build muscle in less than 20 minutes. Exercises are performed in “triplets” - two cardio or strength moves paired with an isometric hold, which will challenge your slow- and fast-twitch muscles.

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