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I currently run 4 times a week with a general profile something like this:
Sunday - long run 15-20km
Tues - Hill sprints or track repeats - 8-10k inc warm up/down
Thurs - tempo or similar - 10k inc warm up/down
Sat - Parkrun plus jog home - 9k total.
If i want to increase my weekly distance would i be better off adding an additional run or lengthening the ones i currently do? Is there an advantage of doing it one way over the other?