Start in a lunge position with your right foot forward. Lunge down and then push off the ground and quickly switch legs in the air, landing in a lunge with your left foot forward (You can use your arms in any way that feels natural to help you get off the ground).
Repeat the same switch jump two more times (3 total), landing with your left foot forward, and then jump off the ground and land on your left foot only (that’s your hop). That’s one rep. Quickly return to your lunge position and repeat again, this time landing with your right foot forward, and then hopping on the right leg. Continue alternating legs until you've done 8 reps total.
To make it harder, don't use your arms to help get you off the ground (cross your arms over your chest as you do the lunge and hop movements).