Slide show: Pregnancy exercises

To do a step-up, you'll need a small step stool — or you can stand in front of the stairs. Position yourself near a wall or railing for extra balance or support, if needed. Pushing primarily through your lead foot, lift your body up onto the step. Then step backward to the starting position. Alternate your lead foot each time you step up.

When you're doing step-ups, remember to keep your back straight and plant your foot entirely on the step. Do as many repetitions as you can, depending on your fitness level. Stop when you're fatigued or your form begins to suffer.