High step ups from foam balance mat (Balance, single-leg, stepping up/down, from foam mat)

Stand up straight close to a wall or solid supporting surface.
Place a foam balance mat on the floor in front of you.
Step onto the balance mat using the wall to balance as needed.
Try to let go of the wall while keeping your balance.
Keeping your gaze straight ahead, step up onto the high platform.
Control the movement as you step back down onto the balance mat.
Repeat this exercise.