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Having only started running when I was 50 (two & half years ago) I've since done a couple of 10k's , a 10 mile and a half marathon, (would love to do a full marathon at some point). I'm not that fast 10k =58mins, half M = 2:10. I've tried to do some speed work, but just can't manage more that 1 x 800m speed session and that's it I'm totally shot. Tempo sesions are not too bad.
Should I accept I'm just too old to get any quicker and just enjoy my 10 min / mile plods or is there something else I should try?