Learning metaphysics requires certain thinking ability and cultural accomplishment, but it does not require specific physical conditions. Therefore, whether people with weak constitution are suitable for learning metaphysics needs to consider their personal interests and learning ability.
If a person is interested in metaphysics and has the corresponding thinking ability and cultural accomplishment, he can try to learn metaphysics regardless of his physique. At the same time, in the process of learning, you can strengthen your physique and improve your health.
In a word, whether people with weak constitution are suitable for learning metaphysics needs to be judged according to specific conditions. Anyone who is interested and capable can try to learn metaphysics.