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©2013 UpToDate ® Print Email Balance Use a wobble board or balance disk to improve knee strength and balance ability. If a wobble board or balance disk is not available, try balancing on the affected leg while lifting the unaffected leg off the ground; do not hold onto any support. Hold this position for a count of 5 to 10. Rest and repeat 10 to 15 times. To increase the difficulty, raise the unaffected leg into the air.