You have worked the front and sides of your core, as well as your arms, hard with these poses, so now you can take a counter stretch to open these areas and strengthen the backs of your legs and lower back.
Bridge pose can be used to resolve tight muscles on the front of your body and to strengthen and tone the muscles supporting your lower back and hips.
Next time you find yourself wanting to switch things up in your routine, let yoga and the weight of your own body guide you into new and challenging territory.