Supine yoga poses (poses where the belly faces upwards) can be used to strengthen the back of the body and the front.
Some supine poses can be done using a wall, very handy if you are tired or are flexibility impaired.
They can also be done without a wall.
A very simple supine exercise with feet against the wall is to press your heels against the wall. This can progress to bending your knees and then using your feet to lift your hips.
A pair of poses you can do while supine is side splits followed by bound angle.
For bridge pose focus on using your legs to push your pelvis upwards. Bend your lumbar spine and thoracic spine backwards. As you do so you can shuffle your shoulders closer to your feet. You can also focus on opening your chest. As you open your chest press your shoulders down into the floor.
First lie supine with arms and legs reaching up. This can be a pose in it's own right, a relaxing one.
Keeping arms and legs reaching upwards, lift your pelvis and then your upper back. Hold this lifted position (dead dog reach) for a few breaths.
Then lower your pelvis and ribcage, followed by your arms and legs.
If you find it too difficult to lift your pelvis and ribcage, or keep them lifted, try holding your ankles with your hands while exhaling then release your hands while inhaling.
For this set of exercises lift your hips and then press up on to the crown of your head. Press down with your hands, slowly lift your head an inch off of the floor. Lower, then relax. Repeat three or more times then rest. Repeat one or two times after resting.
If you are able to lift your head off of the floor in the previous exercise, work at straightening your elbows. Work at pressing all the way up, pause, lower and then repeat. Then work towards holding wheel pose. Gradually increase hold time either counting seconds or breaths.
For happy baby grab one foot and pull the knee to the floor beside your ribcage. Start with other knee bent and then after pulling knee down reach the other leg forwards and work at touching the heel to the floor.
Leave this out if you have neck problems.
Laying on your back with legs up (and hands forwards) reach your legs back and lift your hips. Try to balance on your upper back.
Use your hands to help initially. Lower and repeat. Then try it with your hands reaching past your head (not shown.) Work at a slow and controlled lifting and lowering action.
Lying supine with legs (and arms) reaching up, reach legs and arms forwards (hold on to your thighs if you need to) and sit up, balancing on your butt without touching feet to the floor. Slowly lay back down, lifting legs and arms and resting head on the floor. Then repeat three or more times. If you have to use your hands to help, work at gradually relaxing your arms to the point that you can do this action without using them to help.
You could also finish here.
As a yoga teacher, I'm constantly exploring new exercises, new ways of doing yoga poses.
There is no single "right way" of doing a yoga pose. Instead, there are options. And the better you are at "feeling" your body, the better you can get at choosing the right option for your body as it is now.
For any technique, the point of practice is to learn feel it and to control it, so that it can be used without thinking about how to use it.
And that is more or less the approach taken in all of my ebooks and videos. They help you to feel your body and control it so that you can work towards using it effectively in anything that you do.