Step ups on the plyo box is a great cardio workout and leg strengthening exercise.
Hop slightly and lift one foot to touch the box. Without loading the top leg quick jump and alternate feet.
Step-ups are a great cardio and leg strengthening exercise working your quadriceps, the muscles in the front of your thighs, and involve both your knee and hip joints.
A plyo box is typically used in Plyometrics-style workouts, also called plyos or jump training. However, you can use the plyo box with other bodyweight exercises to add another level of challenge to your workout routine.