This past few days I have noticed a slight pain in one knee when walking downstairs. It is fine in all other situations including running (even downhill). I have a half marathon this Sunday a part of my marathon schedule, as such I have decided to rest it completely for the 3 days prior to the race to be on the safe side. I also have a sports massage booked for tomorrow so will mention this then. Was just wondering if anyone had experienced anything similar? The only thing I think it can possibly be is that my lower hamstrings and upper calf's both feel quite tight (hence the massage) but this is the same for both legs.