This 5-Day Summer Workout Challenge Features Some of Our Sweatiest Workouts

Welcome to challenge day one! What's great about this standing HIIT routine is that you can take it anywhere you want to work out — think: a park, a waterfront pathway, a deck, a beach, a hotel room with a questionable carpet — no mat or clean floor needed. All you need are 30 minutes, space to move, and this video cued up with Willis leading the way.

If you want to do cardio without hopping on a machine or heading outside, this no-mat-needed bodyweight HIIT workout led by Pollard is bound to be your new go-to. In 30 minutes, you'll sweat it out with high-energy moves like squats, skaters, jumping jacks, and fast feet to get your heart pumping.

Day three's workout is only 10 minutes long, but it gets a lot done. Willis will lead you through a series of exercises that work every inch of your glutes, hips, and thighs, including sumo squats, glute bridges, and plank kickbacks. (That's right; you'll get a bit of a core workout, too.) You'll need a mat or soft floor for this one. Ready?

This 30-minute, total-body Tabata workout with Pollard is described as "advanced" because, TBH, it's not easy. That said, he offers many modifications and variations so you can join regardless of your fitness level. Grab a mat — and probably a towel — for this one. It's going to get sweaty.

Ready to bask in all your hard work and finish strong? This quickie 10-minute bodyweight HIIT with Pollard has all the "crushed it" vibes you need for the last day of the challenge — and plenty of moves to get your lungs burning, too. Power through this workout, then pat yourself on the back; you did it!