I have used papain with some marinades for goat meat. Personally I do not care much for marinades any more, at least not long ones. For example, I used to marinate chicken overnight with spices and yogurt when making chicken tikka or tandoori chicken.
1 Pain at the base of the spine causes the psoas muscle to shorten and weaken(1,2,3,). 2  80% of Western people will suffer from debilitating backpain some time in their lives(5).  Western style walking (comfortable shoes & flat ground) fails to trigger muscles that stabilize hip joints & lower back.
Where Are Proprioceptors Located in the Body? The proprioceptors of the musculoskeletal system are found in the tendons and the muscle fibers. These proprioceptors include: Muscle spindles (stretch receptors). These are the primary proprioceptors in the muscles that are sensitive to changes in muscle length. So these allow you to know when to stretch your legs while walking, or your arms when reaching for something.