Enhancing Exercise Adherence Among Patients With Lateral Hip Pain

Greater Trochanteric Pain Syndrome (GTPS) is a condition that causes pain on the outer side of the hip. This clinical trial tests a simple exercise timing approach for adults with GTPS. The main questions it aims to answer are: * Can enough people with GTPS be recruited and complete this study? * How many participants fill in their questionnaires at all five check-ins? * Do participants find the exercise timing approach easy and acceptable? Researchers will compare three groups. Each group receives different guidance on when to do their exercises. This will show whether timing guidance (with or without reminders) works better than usual care. Participants will: * Follow a prescribed hip exercise programme set by their healthcare provider * Fill in a short daily survey (1-2 minutes) for 28 days * Complete online questionnaires about hip pain, movement, and exercise at five - points over about three months * Join an online group discussion at the end of the study Adults aged 18 and over may take part if they: * Have been diagnosed with GTPS by a healthcare provider * Are able to exercise safely * Own a mobile phone Taking part may help participants keep up with their prescribed exercises, which may in turn reduce hip pain and improve daily activities. It could also help researchers find better ways to support people with GTPS in the future.