This is relaxing exercise for lower back, especially if you have problems with lower back pain.
To perform it you will need an exercise mat.
Get in quadruped position with knees and hands on the floor.
Hands are shoulder width apart, back is straight and knees are in stable position.
Raise your leg and the opposite arm and put them in a straight line with the body.
Hold in that position for 2 seconds. Return to basic position and switc