When the sprogs were little I had a day off and decided to go for a ride on the bike. I had to be back to collect them from school, and hadn't left much margin.
Set off and - although it was a little breezy - all seemed fine. Half way round I was onto some higher ground with no cover - and realised I had a 4 mile stretch of (relatively gentle) uphill, into a 30-odd mph headwind. Hmm. Seemed to take forever and I was bricking it about being late.... hadn't punished my legs like that for years. They were aching for days.