Stand facing a low step.

Place foot of one leg on step.

Step up with this leg and then place the foot of second leg on step.

Step down with second leg.

Return to original standing position by placing foot of first leg on floor.

Repeat with opposite leg alternating first steps with different legs.

- Keep your back and leg straight.

- The step you use should be the right height: your knee shouldn't bend less than 90 degrees.