Hikers need strong muscles. What you eat every day shows up on the trail: strength, endurance, stamina on your day hikes and backpacking trips. 10 Foods That Are Great for Building Muscle - Strength Authority
Psoas muscle attaches to your lower spine and to your thigh bone. If it's tight (sitting too much?) it pulls your lower back. It's one of the common causes of lower BACK PAIN! If you can stretch this regularly then your lower back may feel a lot better!