Stretching to prepare External fixator tibia

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Hi guys, can someone help me find some exercises focused on Achilles tendon and other things about the muscle around the tibia. I tried to find it on internet but are pretty " easy" and few.

P. S Wrong position of this post i' m sorry

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 >:The thing is I'm bad on flexibility( in particular on my femur muscles) so I want to  be ready to avoid ATL and reach a decent cm of Lengthening

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I started to stretch my calves last week and I feel like 0 tightness, the problem are my upper back muscles on femur( however if I do external tibia they should not be a problem, right?) . How can I measure my dorsiflexion?
Thanks for your help guys.

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One leg is 15cm one leg is 13cm, so should be good I guess.
Thanks for your help.
You speaked about hamstring but not about the back muscles of the femur. However in your speech you speak about kinetic chain, so are you saying I have to streach all my legs muscles(?) sorry I did not understand

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In particular my flexibility is bad with : muscle semitendinosus, muscles biceps femoris, semimembranosus