Push off with your right foot and jump to the left, landing on your left foot while swinging your right foot behind your left leg and swinging your right arm across your body.
Immediately push off with your left foot and jump to the right, landing on your right foot, swinging your left foot behind your right leg, and swinging your left arm across your body.
Continue alternating sides, making sure to land softly each time with your knee slightly bent.
Keep up a brisk pace for this exercise, aiming to move from side to side as quickly and fluidly as possible, just like a speed skater.