They are bad regardless. They are just less bad if you train more than 5 weeks :) I hit 3:55 taking it easy and never hit the wall, though my legs felt like w

They are bad regardless. They are just less bad if you train more than 5 weeks :) I hit 3:55 taking it easy and never hit the wall, though my legs felt like wooden poles. The 5 week training plan wasn't optimal, but I went into it as a bike rider who rode 100-150 miles a week and didn't bat an eye at a 100 mile ride. So, cardio was there, leg muscles were partway there etc. Just didn't quite have enough muscle built up to support the knees.