I'm looking at the 28 Day challenge Megan posted today and I see LISS as an alternative for 30 min Dance Cardio. What does LISS stand for? Thank you!

Low Intensity Steady State so rather than HIIT ( High Intensity) you'd do a cardio for a bit longer maybe but less strenuous like a jog instead of sprinting or maybe the dance cardio stuff from Megan or an easy-ish kickboxing/martial arts cardio class (i like those). I had to look this up too. I believe it is more than walking.