Perform 10 reps to the right and then switch to the left side. Beginner modification: Knee raise. Advanced modification: Hold a dumbbell in each hand for a weighted curtsy lunge.

Continue alternating, performing 10 repetitions total. Beginner modification: Standing side leg raises. Advanced modification: Hold a dumbbell in each hand for a weighted side lunge.

From here, staying low, move your bodyweight to the opposite side, so you’re in a low lunge position on the opposite leg. Stand up, and then start your next rep on the same leg.