Tweaks to My Marathon Training

I have settled into a two week long cycle for my marathon training. I will do four of these for eight weeks of marathon training. That added to my five weeks of 45 mi/wk in February and March plus two weeks of taper is 15 weeks of training. My latest schedule is here
Mondays and Saturdays are off. Tuesdays and Thursdays are 30 minutes of hip extensions/abductions and abs crunches. Wednesdays are a one mile run at 143 bpm, Fridays are a 2.5 mile run at 140 bpm. The first Sunday is a long run of 20-24 miles at 134 bpm and the second is a 10 mile run with a 4 mi run at 137 bpm in the second half.