What was I thinking?
I mowed our very hilly and irregular lawn with the push mower today. Now I can hardly hold up my arms to type. I haven't used the push mower to do anything more than trim the yard in the last 5 or 6 years since my youngest has become old enough to mow with the John Deer.
I don't know what I was thinking. It's not just that I am incredibly sore, but I feel quite nearly incapacitated! I really think - at least in these instances - I should act my age!

I HATE it when something I take for granted no longer works quite the same. As I recall, parts of the area you mowed are fairly steep. Since you've changed your exercise regime your muscles just aren't used to that kind of effort.
I hope you're back to normal soon!