Warm up tech and stretch tech

hi,
my goal is to add some lenght to my about 6 1/2 by 5 1/3 one, i already ask about it and the answer is to focus on stretches.
what i don’t understand from videos and routines is the warm up tecniques (if there are alternatives also) and the strenght to use for stretches, i mean, what should i feel to understand that i’m applying the right pull on the tendons?

thanks

DG

Warm-up techniques include heating pads, hot water bottles, socks filled with rice that are microwaved, and simply applying a hot wet sock to your cock. Anything that gets the tissue warm should do the job.

With stretching, guys generally pull as hard as feels safe and sustainable for the peirod they aim to stretch. Hand and arm strength may limit your sretching routine at first.