Training walk

I haven't done any long walks for a few weeks its only a month until I have to walk 40 miles in one day so I decided I had to clock up a few miles today. I did the first 6 miles with Teddy ( it's his 8th birthday) then I carried on and did nearly 17 miles in total. My legs and feet hurt but no blisters. I need to walk more otherwise I'm really going to struggle on the day.