Bit of background - I have been a runner for years, really a 10k runner but have done a few halfs as well. I have run regularly (3-4x a week) for at least 12 years and run daily for the last 3 or so. I also swim and latterly do a daily yoga practice. So I would say I was fit but not ludicrously so. I am a slowish runner (55min is my 10k pb, I swim a mile in about 45 mins).
So here is the issue - over the last while (six months? not sure really) I have really really struggled with distance. I am barely able to run 5k without having to stop - out of breath or just exhausted. Stamina for swimming seems to be OK as in, I can still swim my 1K-1-mile distance.
What is wrong and what can I do? I have agreed to do a 10k with a friend in about a month's time - she is not super fast and normally this would not be an issue but I am genuinely worried I won't get round?
I haven't done any races for a while due to Covid obvs; the last 10k I did was about 2.5 years ago now. But in lockdown I was running 7-8 k no worries.
Three things: 1) I have put on weight (lots of reasons, comfort eating due to other issues in my life, v sedentary job that moved to wfh, stopped doing 5:2) 2) I am post-menopausal (but that is not very new) and 3) I had Covid in the summer but not badly, one day in bed is all.
Anyone got any great tips for improving my stamina? Should I be eating more pasta or going to bed at 10pm every night? Would love you thoughts, TIA