Stand with the feet hip-distance apart. Keep your upper body straight, core engaged, with your shoulders relaxed, and your chin up.
Step forward with your right leg, lowering your hips until both knees are bent at about a 90-degree angle. Make sure your front knee is directly above your ankle, and your other knee gently lowers softly to the floor.
Keeping your legs where they are — right foot in front, left toe on the ground behind you — straighten back up. Then continue pulsing in this lunge position before switching sides.
If you're doing these for reps and sets, Johanna suggests doing 3 sets of 15 per side.