Which exercises a cyclist should do before/after any ride? Any exercise that can help the muscles to have more optimism while riding, or relief sore on muscle. I also accept any special massage.
I get enough stretching while getting my pants on before a ride.  I take the first 10 minutes fairly slowly too, because its in traffic with lights.  A drink of water before you go helps with pre-hydrating.

Afterward, do a cooldown ride for the last 5-10 minutes, not too fast.  A hot shower helps, followed by clean fresh clothes.  Then go clean your bike.

Some people use sports massage or self-massage with a roller to beat up tense muscles.