I was knocked out from the day after NYD to about 8/9 days later with a bug the other week. I kept on running while I was ill as I couldn't stand doing nothing.
Whether that made it worse or not I don't know, but while I was out on my runs I definitely felt leggy. I'd get a mile in and I couldn't carry on - more muscle fatigue than lack of breath etc. And while I hadn't been doing as much as I was in October/November, I'd been maintaining at least 2 x 5 mile runs per-week and doing gym work etc.
I did a 3 miler on the 13th and felt okay. Last week did 3 outdoor runs all around 2-4 miles at steady pace. Still found it hard to push myself tbh.
This week, I've been in the gym mostly. Trying a new form of interval running that I've seen online. Actually really enjoying it and definitely feeling it. It's based on what John Terry does/did to get in shape for pre-season. Set the treadmill to incline, 20 seconds sprints, 40 seconds rest. JT does it at something like 12 incline and 17 km/h. I started off at 6.5 incline, 14.5 km/h. Moved up to 7.5 incline on the next session, 14.5 km/h. Then on the third one I've done so far had it on 8 incline at a mix of 14.5 km/h with a final push to 15 km/h. JT did 15 seconds. I went 10 for the first two and then 12 for the third. Just trying to build myself back up and not wanting to overdo it and cause any injuries.
Each day I've mixed that with an upper session day one (Sunday 20th), all-round cardio/circuits (Tuesday 22nd) and then legs (Wednesday 23rd).
Thankfully a bit warmer today so I'm gonna get back out on a run this evening. Not that I mind the cold, but don't like running when it's been icy, always feel like I can't get into my stride. I often find that once I switch back to interval for a little while, then I see an immediate positive impact on my fitness when running, so hopefully I can pack a quick 3-4 miler in a decent time (around 28 mins was what I was hitting in November for 3.8 miles I remember).