[infamousclyde]

This is kind of curious. Isn't that 2/3 energy slump usually associated with the marathon distance, as your body exhausts glycogen reserves? You shouldn't be bonking at 15k. Moreover, I would never recommend to stop eating carbohydrates as a distance runner. I think it's great you lost weight and hit a PB, but I would lean towards consistent training with key workouts and a balanced diet leading up to a race.

[dhsysusbsjsi]

I’m 92kg +/-, 187cm. Run 2x a week 6.5km like clockwork, plus extra fitness 2-3x a week. So heavy guy. I do about one 1/2 marathon a year and train up to 15km. Heart sits at 180-185 by the end. The 18km is definitely a hump where it’s not aerobic fitness but feels like need to push through a mental wall. I don’t think I have the physique for a full marathon without proper preparation but may try next year.

[kashyapc]

Yes! On "diet" — as the saying goes, "you can't outrun a bad diet."

I want do some strength training besides the usual bicycling and running 3-4x a week. But I keep dragging my feet with it.