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I was doing 25-30 miles/week and my legs fell apart at 18 miles in both my last long run (22 miles) and the marathon itself. Both times I ended up doing walk/jog to get to the end.
That marathon calculator gives me a predicted time of 4h14 based the appropriate 5k time, I was on track for 4h45 until that 18 mile mark and ended up with a 5h07.
Most of this is due to a combination of two things:
- not enough miles in the legs (I'd hope to be up to at least 40 miles/week for next time - can't do that now on top of swim/cycle training and family life)
- being 10-15kg heavier than I'd like to be
- not enough miles in the legs (I'd hope to be up to at least 40 miles/week for next time - can't do that now on top of swim/cycle training and family life)
What qualifies as "miles in the legs", as in what distance/week?