Stand in the shallow area with both legs together and your hands on your waist.
Jump and wide open your legs, then jump again to close together. Feel the resistance as you push out and in.
Inhale as you open your legs. Exhale as you close.
Feel your outer thighs as you open your legs and your inner thighs as you close.
Tip: this exercise can also make a good aerobic workout if combined with other exercises like Arms & Legs Adduction - Abduction