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!
YES, you do need to eat after a workout!The 14 Best Things To Eat After A Workout. These supply nutrients like proteins, carbohydrates, vitamins and minerals which help restore your energy and build muscles after a workout.