This workout https://www.fitnessblender.com/videos/fat-burning-cardio-bootcamp-butt-and-thigh-workout-with-low-impact-modifications made me sweat so much, get out of breath and turn bright red, especially going down to the floor to do mountain climbers and plank jacks, I must have been glowing like the Ready Brek kid of yore.

It's an amazing workout, I didn't want to do an exercise that lasted for over half a hour or at all really so not only was it short, it felt like it made a difference. I recommend it if you have zero time or inclination.