| TIMEPOINTa | t0 | t1 | t2 |
| ENROLMENT: |
| Eligibility screen | X | | |
| Informed consent | X | | |
| Allocation | X | | |
| INTERVENTIONS: |
| Foot exercise and education | | | |
| Brief advice | | | |
| ASSESSMENTS: |
| Participant characteristics | X | | |
| Primary outcome measures |
| Feasibility |
| Number of eligible participants | | | X |
| Willingness to enrol | | | X |
| Recruitment rate | | | X |
| Adherence | | | X |
| Logbook completion | | | X |
| Adverse effects | | | X |
| Dropout rates | | | X |
| Credibility |
| Borkovec and Nau Questionnaire | X | X | |
| Acceptability |
| Number of sessions attended | | | X |
| Adherence to foot exercises | | | X |
| Additional treatment sought | | | X |
| Early withdrawal | | | X |
| Secondary outcome measures |
| Patient reported outcomes |
| First step pain in previous week | X | X | |
| Worst pain in previous week | X | X | |
| Average pain in previous week | X | X | |
| Foot and Ankle Ability Measure | X | X | |
| Foot Health Status Questionnaire | X | X | |
| Global Rating of Change Score | | X | |
| Pain Self-Efficacy Scale | X | X | |
| Active Australia Survey | X | X | |
| Physical measurements |
| Intrinsic foot muscle morphology (MRI & ultrasound) | X | X | |
| Plantar fascia thickness (ultrasound) | X | X | |
| Intrinsic foot muscle motor performance | X | X | |
| Foot Posture Index | X | X | |
| Foot mobility | X | X | |
| Ankle dorsiflexion range of motion (standing lunge test) | X | X | |
| Toe flexor strength (dynamometry) | X | X | |
| Plantar flexor strength (standing heel rise test) | X | X | |
