Hi Hanaed5,
I used to do a lot of mountaineering, climbing and caving - so prolonged exercise over long periods. I still do but not as frequently.I found that I needed to reduce insulin amounts (I too am on a MDI regime) and up the amount of carbs I ate. For example on an 8 hour day in the Scottish highlands it was often the case that my bolus injection in the morning would last most of the day with bg results of 6.5-7 being the norm and I was still snacking thro the day. Clearly I was burning it off almost as fast as I could take food in. It does come down to a bit of trial and error I'm afraid, for you to find out what levels work best but as a generalisation, the more endurance sports seem to require smaller doses and regular food intake. Also a major factor to take into consideration is the recovery time your body needs. After any excercise but particularly like ones mentioned above I found my body was taking several hours, often all night to replenish supplies so after a few episodes of grabbing the lucozade I realised that I had to reduce the night time jab after the event and eat more than usual in the evening. That tended to work and morning results were good. It sounds like you are exercising every day so your body is taking a bit of a pounding (in a good way) but you will need to adjust doses and carb intake to compensate and also allow your body to recover so that you benefit from the exercise you are doing. Apologies if you are already doing this but maybe take some fluids on yr run other than water, diluted orange juice that will have some carbs for example and take regular sips etc.
Hope this might help in some small way. Good luck.