I've been running for about 8 years now. Prior to lockdown I was running 1-2 times a week but now I'm working from home I'm back to going 3 times a week. I tend to do 2 x 5km runs and 1 x 8km run a week so not big distances. Set off today feeling fine and decided to do my hilly 5k route (it has 2 hills for context here). I hated every minute of it! My legs felt like jelly, I felt like I couldn't breathe deeply enough and (oh the shame!) I actually had to walk up the main hill on my route. Is this normal? Have felt fine all day so don't think I'm going down with anything. Does anyone else have this?