It’s good to see the recent tips for keeping fit , but please don’t dismiss the value of electric bikes in the same breath as cars or scooters (Letters, 11 October). An e-bike will take you nowhere without physical input from the rider. Having undergone major heart surgery some years ago, I can testify to the huge benefits to my wellbeing as a result of the thousands of miles I have covered on my e-bike, including two coast-to-coast rides with my fellow patients, the Electric Cranks. Bob Gower Blackburn, Lancashire Regarding the discovery of an 18th-century cold bathing pool in Bath (Archaeologists uncover rare 18th-century cold bath under Bath Assembly Rooms, 9 October), a similar stone-lined and spring-fed plunge pool, part of a listed Georgian two-storey building, was saved and restored more than 20 years ago here in Congleton. Volunteers have maintained the building and added a physic garden in its grounds. John Cockell Congleton, Cheshire Many, many years ago, when I was reviewing old essay questions for an upcoming entrance exam, one stuck in my mind: “Distinguish between a sport, a hobby, a game and a pastime” (Letters, 12 October). I can’t recall what I was trying to enter, let alone why, but the question has occasionally provided a starting point for a sixth form discussion. Dr Andrew Ruddle West Molesey, Surrey Lisa Cameron’s defection from the Scottish National party to the Conservatives (Report, 12 October) is a rare example of a rat joining a sinking ship. Michael Meadowcroft Leeds Have an opinion on anything you’ve read in the Guardian today? Please email us your letter and it will be considered for publication in our letters section.