This graduate student research study has two purposes; the first purpose is to examine the criterion validity of the Y Balance Test (YBT) with the Limits of Stability Test (LOS) in healthy middle-aged adults. The second purpose is to examine balance changes using the YBT following a home-based exercise program.

4. "Subjects will be healthy female or male middle-aged adults who are able to walk and move independently.

5. "Subjects will be between 45 and 64 years of age." 6. "In total, subject participation will last approximately eight weeks. Visit 1 (baseline): 90 minutes, visit 2 (week 4): 30 minutes, and visit 3 (week 8): 60 minutes.

7. "Subjects will be recruited by distributing flyers in the Loma Linda Community, sending emails to school staff, students, and faculty, and word of mouth.

8. "Consent will take place at Loma Linda University, Nichol Hall rooms A620 -A640 by investigators." 9. If Multi-center: N/A 10. If Single center or investigator-initiated: "70 subjects will participate in the study."

Inclusion Criteria:• Healthy adults.

• Age range: 45-64 years.
• Able to walk and move independently

Exclusion Criteria:• Dizziness, visual or neurological disorders that prevent the ability to complete the testing protocol.

• Lower limb injury in the last 3 months.
• Lower limb surgery in the last 6 months.
• Current involvement in a rehabilitation program.