SPIRIT (2025) checklist for OUTSIDE 2: Outdoor swimming as a nature-based intervention for depression

This document is the SPIRT (2025) checklist for the OUTSIDE 2 Randomised Control Trial Protocol. Background on OUTSIDE 2: Outdoor swimming as a nature-based intervention for depressionMany people say outdoor swimming improves their mental health. There has been some research showing outdoor swimming helps people with depression, but not enough to say for certain. In this study, we offered an outdoor swimming course to adults with depression to see if it can help them. This clinical trial and will tell us if outdoor swimming does help to reduce depression symptoms.