How much should one speed train, in relation to my total mileage? Some resources (this one for instance) say that the amount of interval training should not exceed 7-15% of your total mileage. My question is: Is this also true for runners with very low mileage?
I'm currently training for a 6.5km (4miles) race. Due to my strength training schedule, I can only go running twice a week. I thought about doing interval training on Sunday and low intensity running on Thursday, but according to the above rule, this would be way to much interval training. Should I really be interval training only once every 4 weeks (which would be 12.5%)?