Stretching, before, during and after rides -- especially my neck and legs.

Gradual warm up for the first 10-15 minutes, staying in the small chainring, which conveniently covers the easiest parts of my usual workout routes anyway.

After that warm up I'll stand for about 15 seconds to sorta-sprint or climb the first short steep climbs, just to see how the knees and legs feel. If it goes well I'll increase to 30-60 seconds standing on the pedals to get the blood flowing a little better and check the legs before reaching some tricky segments where I might want to improve my times.

I may start using an indoor trainer before rides to warm up. A friend gave me one he wasn't using. Turned out to be more useful than I'd expected.

After rides I may use a ridiculously heavy nearly solid marble rolling pin on my thighs. It's mostly a kitchen ornament, although I may use it for baking once a year. Yeah, I'll wash it before making those cookies and biscuits.