About poses during recovery, I would suggest pawanmuktasana part 1 (as described in Asana, Pranayama, Mudra, Bandha, published by Satyananda Yoga). This is a sequence of poses to bring flexibility and circulation to every joint. Do them from a lying
position, in which case knee bending becomes cycling, then moving to sitting
from there on. Do it with the rhythm of breath.
I also suggest supported poses, where the body can relax. The inner organs are stretched or compressed, and hence get renewed circulation. This brings added nutrition and removes wastes from the organs. This is true in most yoga postures. During convalescence, having this effect with minimal energy exertion is a big bonus.
These are a supta pawanmuktasana with a rolled blanket under the buttocks. Hold the pose first just with legs bent, like a gentle kandarasana, then just hold one knee to chest with the other leg bent. Head movements only if you feel strong enough. For inguinal hernia, with the exhale for all these movements, make it a controlled abdominal breath. Especially important during cycling, and to lower the leg during the exhalation. This will support the back and the abdomen, and actually encourage the hernia to resolve. I mean strong exhalation, taking navel to spine. It is the hatha yoga form of uddiyana bandha. Full yogic breath done lying with the chest supported 4" and the head supported 6" will encourage a fuller breath and take you further into yourself. It opens the chest which increases oxygen uptake from lungs, eases the work of the heart. This support can be either long along the spine, from lower ribs to head, or two separate supports horizontal under the chest, then some space for the shoulders. Experiment. You might also try forward bends just as janusirshasana.
This is good for the hernia. But - do it with the head supported. It depends how flexible you are. I teach it with a chair over the leg, the forearms folded onto the edge of the chair and the forehead resting on the forearms. This is very resting for the head and may ease the nervous system from Parkinson exhaustion.