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Maybe, though I was completely virus and bug free between March and September, and then from September onwards, my daughter started reception year, and my son started nursery.
I had the same thing when my daughter started nursery, every other week she would be snotty and sneezing. Can't avoid wiping your kids noses, or them sneezing right in your face.
In terms of eating/volume, I was doing about 6-7h of structured training, about 1.5h of strength training, and running on roughly 600-700kcal deficit, so not crash dieting, or over training.
Was making really good progress during the first lockdown, and was the most aerobically fit I remember being.
However, with the second lockdown and about 5 consecutive colds during Autumn and winter so far (9 month old going to nursery) my fitness has crashed down below pre covid levels...
Fortunately my weight hasn't ballooned catastrophically so my FTP W/KG is at the same starting point, but I've lost about 50-60w in 3-4 months.
Last time I gained 40w in 2 months with 2 repetitions of the Zwift 4w FTP booster, while also dropping 7.6kg. Trend it fitness was still going up, but didn't keep building (probably should have kept the momentum going)
So planning to do that again, but with a gentler 6 week FTP builder plan to start to get my legs spinning better again. Also with 1 week easy between each block.
Hopefully get near the weight and watts that I was at during the summer by mid March and then keep building towards 5w/kg.
Intermittent fasting (11am-7pm)
Harder workouts: 11am small pre ride snack, 12pm workout
Easier workouts: 11am workout fasted, 12pm lunch
Supplemented with yoga, stretching, some kettlebell work and burpees.