Working out at home is a great way to save time and money, not to mention avoid going outside when the weather is steamy. And good news: Not only can you avoid delayed subways or traffic, but you can also get an effective workout in in less time than it takes to blow-dry your hair.

Workouts that clock in at 10 minutes or less are very popular right now, thanks to a growing body of research that suggests working as hard as you possibly can for just a few minutes can lead to similar benefits—like increased fat burn and aerobic endurance—as longer, steady sweat sessions.

Ready to squeeze in some squats before breakfast? We scoured the internet for the best super-short workout videos from smart, star trainers and hot fitness brands, like Jillian Michaels, Anna Kaiser, and Barre3. All involve intensity—whether they target specific muscle groups like your abs or glutes or rock your whole body, head to toe.

The best part? They’re all completely free.

Try one on an extra busy day when getting to the gym is just plain impossible, or stitch a few together for an even more butt-kicking routine. Just be sure to wipe down your living room floor before your dinner guests arrive.

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