This question is directed at Malmo, though others can feel free to answer.
Awhile back I read that one of his favorite workouts for a half marathon was 5 mins. hard 5 mins. easy for maybe an hour or so. I'm curious what effort he would recommend running the 5 min. hard parts, in additon to the 5 min. easy parts? Im a 1:13 Half marathoner iof that helps with weekly mileage around 70-80 mpw.
I ask because I like that this workout seems very time efficient, something Im always looking for. Just get out on the roads for an hour and back home - this helps me maintain marital bliss.