Please assess the completion status of the following clinical trial:

Trial Title: Exercise for Low Back Pain in Children

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: PREVENTION
- Time Perspective: None
- Masking: DOUBLE
- Phase: None
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Children aged 12-13 years~* Complained of LBP in the past three months~Exclusion Criteria:~* Serious spinal pathologies or deformities (e.g. severe scoliosis, spinal tumours)~* Neurological conditions which alter motor tone~* Physical disabilities (e.g. spinal cord injuries) which prevent the child from being able to stand up on their own without an orthotic device or brace, or which prevent the child from taking part in normal physical education (PE) classes~* Any other serious co-morbidities (e.g. cancer, severe lung pathology)~* Provincial sports participants, or children who were currently following a specific training programme with a biokineticist or physiotherapist~* Current orthopaedic procedures or fractures of the spine, pelvis, lower or upper limbs

- Gender: ALL
- Minimum Age: 12 Years
- Maximum Age: 13 Years
- Healthy Volunteers: f

Study Arms:
- 1. Experimental Group (Type: EXPERIMENTAL): Exercise Intervention Group
- 2. Control Group (Type: NO_INTERVENTION): Control group - no intervention

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