My husband and I are training for our first 10K. We have been jogging almost two year now and have completed several 5K runs. We are adding a little each week to our running schedule and can manage 4 miles now and have done 5 miles twice and it took us over an hour. Several people have told us we need to look into refueling during our runs at this point but we don't know what that means. We live in the middle of our route so we can stop to get water when we need it. I am 61 and he is 63 if that makes a difference. Can anyone help us with this?