When you’re short on time but still want to do a workout that gets your heart pumping and your body moving from head to toe, HIIT is the way to go. HIIT stands for “high-intensity interval training,” and it involves short bursts of exercise followed by limited rest. If you haven’t warmed up your body already, I recommend starting with a short sequence: arm circles, side stretches, inchworms, toe touches, and jumping jacks. Now, let’s get ready to move! Your 4-week challenge: As the holiday season is upon us, it can be challenging to keep up with a consistent movement regimen. This month, I’m sharing four different routines you can do from home or while traveling—each one is quick, efficient, and also fun. I encourage you to make these routines part of your weekly workout schedule as often as you can, but aim for at least two to three times a week.