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.
Based on their names, deduce some characteristics of the following muscles: tibialis anterior, erector spinae, rectus abdominis. Tibialis anterior- a muscle overlying the tibia anteriorly. Erector spinae-muscles that straighten the spine. Abdominis rectus- muscle that runs straight up the abdomen.