Posted: 22/10/2014 at 19:11
I agree with seren nos, start now to get more miles or kms per week and build up the amount of time on your feet. That will make the endurance part so much easier to cover. Although you perhaps love the gym I'd say the treadmill isn't the same as running outdoors.
This could be a Major occasion in your family's life If you choose to go ahead with it.
I wish you every success if you decide YES!