parkrun — free weekly community 5K runs and junior events

parkrun organises free, timed 5K runs every weekend at hundreds of parks and green spaces across the UK, plus free junior events for children on many sites; they are open to everyone and there’s no entry fee. Runners register once online to receive a barcode, then turn up and take part for free; events are volunteer‑run and welcome all abilities, providing a structured, no‑cost way to exercise and join a local community.