I think I understand the idea not to increase total running distance by more than 10% per week, but how does that apply if one of the runs is quite short (for whatever reason?). So, let's say I run 5, 6 and 6km one week total 17km. Next week's total can be 17 plus 10% (+ 1.7 ) or 18.7 km. What if the following week I then run 5, then 2km, can the third run then be 11.7km or 100% longer than my longest run do far?! Example is deliberate in this case to illustrate issue. Is there some additional guide for max extension of longest run in addition to max 10% of total mileage? Maybe don't exceed any individual longest ever run by more than 10% of last week's total mileage. In the above case don't exceed 6 + 1.7 = 7.7 km?