When it comes to quick, effective workouts, you can't beat HIIT (high-intensity interval training). Structured around timed intervals, you burn more calories in a shorter time in HIIT, since you push yourself based on your own rate of perceived exertion scale. And that's another reason we love about HIIT! It's scalable to every fitness level since you work at your individual level to perform as many reps as you can in the allotted interval.
Because we love it so much, we've rounded up a bunch of HIIT workouts for you to try. Best of all, you can do them all in the comfort of your living room. But you might want to download that SIT timer app to keep your intervals on track.