There’s a great book called (I’m not joking here ) how to be a supple leopard
very in depth with practical stretches
I paid lips service to stretching for years , football , army pt , all that training etc straight in the shower , slice or toast and away
my calves are ridiculously tight now , my lunge is pretty non existant,
I’m in the gym 20 mins now before every session , calf raises , tip toe pointing , monkey walks , lizard crawls , walk outs and a slow steady warm up
At 50 , you need to be looking now at quality rather than quantity , look at stretches speci