START:  Start by putting a band around both wrist. Drop down to the ground so your hands are under your shoulders the n rise up onto your feet, so you are on all fours. There should be tension on the band that is between your wrist. 

EXERCISE:  Being up on all fours, move forward about 10 yards or more keeping the bands stretched throughout the entire movement. Make sure you keep your hips and shoulders the same height as you crawl forward and keep puling the band apart with your wrist as you move. 

MODIFICATION:  You can do your bear crawls backwards and lateral to change up the exercise.