Festive Fitmas: Fa La La La Fartlek Hey, rockstar, you are going to crush this workout! However, I want to hear from you. So send me a text and let me know how it went! Warm-up:Dynamic Stretches Workout:30-minute Easy, Fun fartlek puts you in charge of Santa's Sleigh and has you singing along with speed pickups and recovery intervals. Cool-down:Static Stretches