Inclusion Criteria:

• * Unilateral transtibial amputation within the past 4-16 months
• * Etiology secondary to complications of Diabetes Mellitus (DM) type II
• * Current use of a prosthesis, with at least 2 months prior use
• * K2 or K3 level (as determined using the Amputee Mobility Predictor assessment tool)
• * Own a smartphone

Exclusion Criteria:

• * Amputation due to cancer or macrotrauma or acute hemorrhage
• * Bilateral amputation
• * Medically or surgically unstable contralateral lower extremity as determined by medical criteria (e.g., critical limb ischemia)
• * Severe residual limb pain that limits function preventing participation in an exercise-based program
• * Medical conditions that would interfere with subject's participation in regular sustained exercise
• * Anthropometric characteristics that are not compatible with the technology used to scan the residuum and manufacture the liner and socket (e.g., a residuum circumference greater than 32 inches would not be compatible with the device used to scan the residuum)
• * Current pregnancy