Popsugar Fitness Workouts 20-Minute Lower-Body HIIT Workout Leg Day Is Calling: Try This 20-Minute Lower-Body HIIT Workout From an Under Armour Trainer August 30, 2021 by Samantha Brodsky View On One Page Photo 4 of 5 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 4 Curtsy Lunge Stand tall with your feet hip-width apart. Step your right leg diagonally behind your left leg, and bend your knees to lower into a lunge. Push through your left heel to stand, and bring your right leg back to your starting position. Repeat on the other side. Continue for 40 seconds. Rest for 10 seconds. Previous Next Start Slideshow WorkoutsStrength TrainingHome WorkoutsCardioBodyweight ExercisesHIITCardio Strength WorkoutsHIIT WorkoutsGIF ExercisesIntermediate Workouts