Posture is how your body is positioned when sitting, standing and lying down. Poor posture can lead to discomfort and injury.
The hipflexor stretch for working on tight hip flexors.
(stretches from betterdailyhabits.com)
Brad Walker’s stretching tip #4 Stretch all major muscles and their opposing muscle groups. Pay attention to all the major muscle groups in the body. Every muscle in the body has an opposing muscle that acts against it. For example, the muscles in the front of the leg, (the quadriceps) are opposed by the muscles in the back of the leg, (the hamstrings). Stretching according to Brad Walker