At the moment I'm running 6km three times a week at 5:30 min/k. I do resistance work and then maybe 2/3 rides a week.
BarryP's plan would have me starting back on 15mins a day for six days a week and building up from there. I can see that I will struggle with the shortness of these runs, not to mention trying to do them slowly. I like running for at least 30 mins, but the plan is the plan. https://forum.slowtwitch.com/...ntraining20;#1949381
Will skip ahead if necessary, but i suppose my question was whether this 10% rule has a scientific basis, or is just a heuristic that we've all adopted?