That's why the exercise of the week is: the Dumbbell Step Up.
Tips: The first time you attempt this, try it without weight at a slower pace with a small bench/platform. As you get stronger, add weight and/or raise the bench and/or increase your speed. There's always a way to challenge yourself with this exercise - no matter how strong you get.
Hold one dumbbell by your sides. Step up onto a flat bench with your left leg. Then, step up with your right leg to stand on the bench. Step down with your left leg, then your right leg. Repeat 12 to 15 times, then step up with your right leg first for 12-15 reps on that side.
If you are an elite athlete, you can add a glute lift by stepping on the bench with your left leg and kicking the right leg back instead of stepping on the step with your right leg. Do the same amount of reps as described above.