Faulty formulation: Every occurrence of 'ability' denotes exactly the same thing; once capacity exists beforehand, divine enabling is irrelevant.
Correct formulation: Health, available means, sound faculties and practical capacity are relevant to the obligation placed upon a person. The enabling and ability accompanying the act are distinguished from this prior capacity.
لَا يُكَلِّفُ اللَّهُ نَفْسًا إِلَّا وُسْعَهَا
Allah does not burden any soul beyond its capacity.
Physical capacity by itself does not make one the independent owner of success or enabling grace.