Table 1 Execution schedule – recruitment, intervention, and reassessment (SPIRIT schedule of enrollment, interventions, and assessments)

 Eligibility Criteria

x

 Selection

x

 Informed consent

x

 Pain intensity

x

x

 Disability level

x

x

 Perception of global improvement

x

x

 Specific functionality

x

x

 Demographic data

x

 Duration of low back pain

x

 Risk of chronicity

x

 Map of pain regions

x

 Life stress events

x

 MRI performed

x

 Family history of low back pain

x

 Pilates practice history

x

 Pilates exercises associated with relaxed abdomen

x

 Pilates exercises associated with contracted abdomen

x