The hip flexor stretch is an effective exercise to counteract the tightness that is caused by prolonged sitting (especially in a desk job). To do this, one needs to kneel on the floor, one knee down and other planted in front, to create a 90-degree angle with the legs. Make sure, while in this position, keep the back straight and the core engaged, gently push the hip forward and hold this position for about 20-30 seconds, then try and switch sides. This stretch helps improve hip mobility and reduce lower back pain as well.
