Inclusion Criteria:  Diagnosis of lower extremity PAD based on (and/or):  ABI ≤ 0.9 in at least one legs Invasive or non-invasive imaging of stenotic lower extremity artery disease Endovascular or surgical revascularization of lower extremity artery PAD Fontaine Stage IIa/b Smartphone with possibility to use TrackPAD: Android ≥ 5.0 or IOS ≥ 11.0 Written informed consent prior to any study procedures, including a specified follow-up evaluation Best-medical treatment in the last 2 months in accordance with standard guidelines  Exclusion Criteria:  Wheelchair bound, use of walking aid or walking impairment due to another cause than PAD Below or above knee amputation Acute or critical limb ischemia PAD Fontaine Stage I or III / IV No German knowledge Severe cognitive dysfunction Congestive heart failure with NYHA III-IV symptoms Active congestive heart failure requiring the initiation or uptitration of diuretic therapy Angina pectoris with CCS class 3-4 symptoms or myocardial infarction or stroke in the last 3 months Active arrhythmia requiring the initiation or uptitration of anti-arrhythmic therapy Severe valve disease