Seated Hamstring Stretch
Benefits: Stretches hamstrings and lower back
How to do it: Sit with one leg straight and the other bent, placing your foot wherever comfortable along your inner thigh of the straight leg. Reach towards your foot until you feel a stretch in the back of your thigh while keeping your leg and back straight. Hold in this position for 30-60 seconds and then rotate your torso to bring your arm over your head and stretch your lower back on the side opposite to the leg you are stretching. Hold this position for 30-60 seconds, then change legs.

Low Lunge
Benefits: Stretches hip flexors (quadriceps and psoas) and slight stretch of hamstrings
How to do it: From your downward dog, step one foot forwards and place it between your hands allowing the knee of your back leg to drop to the floor. Hold for 30-60 seconds before returning to your downward dog and then step your other leg forwards to repeat the stretch.