Shakti Mudra is good for inducing sleep. Over a period of time, it helps people suffering from chronic insomnia. Shakti mudra releases the tension in pelvic region. It counteracts spasms in the intestines and helps females during menstrual discomfort.
This pose can be done every single day, and it will decompress your back and lengthen your hamstrings, calves, strengthens your abdominals and back while stretching the chest, and for an added bonus, massages your internal organs!
Seated Heart Opener: The Grounded Tipover Tuck stretches the back of your neck, so do this counterpose to target the front of your neck and chest. It'll also reduces tension in your back, which is one cause for headaches. Sitting on your heels, place your hands behind your feet about 10 inches or so and arch your head back. This Seated Heart Opener makes your head feel light and open, so stay for five breaths or more if you love it.