Bullet Proof Your Knees & Unlock The Explosive Power Of Your Soleus Muscle With These Mobility Standards

According to this guy these mobility tests/exercises can protect your knees.

Also increasing ankle flexibility allows development of the Soleus muscle, which he claims has the strongest pull of any muscle in the body.

I've had bad ankle mobility for years and noticed an immediate improvement in range after just 1 set (on either side) of the first exercise demonstrated.