I think you should first answer this question for yourself, and if you want outside input, then you can post your answers and ask for comment. There is no secret about the components of the PI(E)CO model.

The PICOT format is a helpful approach for summarizing research questions that explore the effect of therapy

P... participants.. patellofemoral pain syndrome patients

I... Not applicable

C... Control or comparator... Healthy matched athletes

O... Outcomes... Lower limb ms flexibility...

P: Participant:- Athletes with patellofemoral pain syndrome

I- Intervention:- Not Applicable

C- Comparison:- Healthy match athletes

O- Outcomes:- Lower limb muscle flexibility