Question: what are dumbbell side lunges?
Answer: Hold a dumbbell in each hand at shoulder height with elbows bent and plant both feet on the floor shoulder-width apart. This is your starting position.
Inhale. Keeping your right foot on the floor, release your left foot and take a big step to your left, holding the dumbbells between your legs. ... 
Exhale. ... 
Inhale. ... 
Exhale.