The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical concepts
Is running up and down a hill better for you than running on the flat? Or does the downhill bit being easier counteract the uphill bit? What about running down a hill and then up, when you’re already tired? Steve Henderson, Wythenshawe
Post your answers (and new questions) below or send them to [email protected]. A selection will be published next Sunday.