Please assess the completion status of the following clinical trial:

Trial Title: Mechanisms of Walking Recovery After Stroke

Study Design Characteristics:
- Allocation: None
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: BASIC_SCIENCE
- Time Perspective: None
- Masking: SINGLE
- Phase: None
- Number of Arms: 1.0

Eligibility Criteria:
Inclusion Criteria:~* age 30-90 years~* unilateral stroke experienced \>6 months prior to enrollment in middle cerebral artery (MCA) territory without complete disruption of the putamen on the lesion side~* walking speed \<= 1.0 m/s on the 10 meter walk test~* able to walk 10m over ground with assistive devices as needed and no physical assistance~Exclusion Criteria:~* MRI incompatibility (e.g. metallic or electronic implants, severe claustrophobia)~* inability to perform mental imagery (time dependent motor imagery screening test \[TDMI\])~* evidence of significant arrhythmia or myocardial ischemia on treadmill ECG stress test, or significant baseline ECG abnormalities that would make an exercise ECG uninterpretable~* recent (\<3 months) cardiopulmonary hospitalization~* unable to communicate with investigators or correctly answer consent comprehension questions~* significant ataxia or neglect (score of 2 on NIH stroke scale item 7 or 11)~* severe lower extremity (LE) spasticity (Ashworth \>2)~* recent (\<3 months) illicit drug or alcohol abuse or significant mental illness~* major post-stroke depression (PHQ-9 ≥10) in the absence of medical management~* participating in physical therapy or another interventional research study;~* recent (\<3 months) paretic LE botulinum toxin injection~* concurrent progressive neurologic disorder or other major medical, orthopedic or peripheral vascular conditions that would limit improvement~* pregnancy

- Gender: ALL
- Minimum Age: 30 Years
- Maximum Age: 90 Years
- Healthy Volunteers: t

Study Arms:
- Arm 1 (Type: EXPERIMENTAL): 4-week control period with no intervention and 4-weeks of high-intensity interval training

Based on this trial design, predict the completion outcome and termination type (if applicable).