I am training for the Baildon Boundary Way (half marathon), which means running further than I have for many years. My problem is not the distance - I am already almost up to 12 miles. But am very much a one pace runner, and that one pace is VERY VERY SLOW. I do try to do a bit of fartlek on my shorter runs (3-6 miles), but nothing much happens however hard I try to speed up. Realistically, I can only do 3 sessions a week, so I try to put in some faster sections on my long run too. However I read that the long run should be done slowly. If I can still get to the end of the proposed distance, does it matter if I push myself on my long runs? I feel that running even slower than I have to is a poor rehearsal for the race. On the other hand, perhaps if I just ran easily for 12 miles I would recover faster for my next run. Please advise! PS the only way for me to speed up is to do the HPTT Parkrun, but then I try so hard it takes me days to recover and makes a big dent in my training week.