Bear crawls are a great bang for your buck exercise to work on close chained core shoulder stability, anterior core strength with a reciprocal pattern. One also has to control rotatory stability. Backward also works some scapular upward rotation. Start of by getting comfortable with the position. Get in a quadruped position and lift at the knees about 2 inches and hold for around 10 breaths. Once comfortable go for a stroll! Practice both forward and backward. *Add a dowel or cone into the mix and this will help improve lumbopelvic control (just don't let it fall)!