Foot Strengthening to Improve Balance and Gait in Older Adults

The goal of this clinical trial is to learn whether different foot-strengthening strategies can improve foot strength, balance, walking ability, and fall-related outcomes in middle-aged and older adults (ages 45-85 years). The main questions it aims to answer are: * Does foot strength change from baseline after an 8-week foot-strengthening intervention? * Do balance, gait, and physical function improve following different foot-strengthening approaches? Researchers will compare minimalist footwear use, a foot exercise program, a foot-strengthening device (ToePro), and no intervention to see if these interventions lead to greater improvements in foot strength, balance, gait, and fall-related outcomes than no intervention. Participants will: * Complete baseline and post-intervention laboratory testing of foot strength, balance, physical function, and walking gait * Perform foot strengthening exercises or wear minimalist footwear (if applicable) five days/week for eight weeks * Complete daily logs to record intervention compliance