Recently, I am currently doing about 25 miles a week ( 6 days a week with one day off). I mix in long runs, tempo runs, fartleks, strides. My easy runs are at about 8:15 pace, longs runs at 9:00, and tempo at sub 7:00. I would like to be at 50 miles a week with interval wokrouts in 12 weeks (end of June or early July). Is that reasonable? I am 24 and I was a serious runner in high scool my best 5k was 16:17. I realize that was a long time ago but I still kept up with running a few days a week since then just to stay in shape(3 or 4 days a week 15-20min). What are your thoughts?