Hi Martin, Personally I don't do the longer runs. We all set off as a group and split off if some want to go longer (due to marathon training) and the others head back. No-one is left behind not even plodders like myself. Unfortunately, dark evenings dictate that we have to run on roads so a short run is about 5 miles although when I was back with my sciatica and achilles, I only did 2 - 3 VERY SLOWLY! So don't worry, if you aren't doing much mileage yet.