Start easy with a baby cobra and progress to an upward-facing dog. These poses (as described in detail in this article) will slowly start to lengthen the muscles on the front side of your body. Then, as these muscles get longer and stronger, you can progress to Fish Pose, Camel Pose, and eventually Full Wheel Pose. Having a yoga goal in mind will help to keep you motivated throughout your practice and will encourage you to keep showing up on your mat.