A Wise Man (once sat next to him)
Both my Hamstrings have gone stiff, as of yesterday. Do you think I'm doing too much, or do I work through it?
Be an idea to Google some stretches as well (and take them easy, stretches can be harder than people realise and can be powerful)
I use a massage thing called theragun. Expensive but awesome. That helps. Just used it actually. Now in my fir sauna!
So a rest or a very light ride and a few stretches would be my opinion. Sounds like you've gone from zero to a hundred miles and hour. The body does need time to catch up.