Exercises to strengthen the knees

6. Step-Ups

Place one foot on a step bench, platform, or the lowest step on a staircase.  Keeping your pelvis level, bend your knee and slowly lower the opposite foot to the floor. Lightly touch your toe to the floor, then rise back up. Repeat 10-15 times, then switch legs. Too easy? Use a higher step, or touch your heel instead of your toe.