Kayfiyyat al-ʿamal means the manner and normative conditions of action, not simply visible bodily movement. It may involve prerequisites, essential acts, required restraints and rules of validity.
In prayer, questions about purification, timing, standing and bowing are practical. In commercial exchange, the conditions that make a contract valid are also practical; the same applies to actions that invalidate a fast.
Calling these rulings practical does not confine them to physical motion. Intention and sincerity may be inward yet closely related to how worship is performed; they can also be discussed within ethics and spiritual formation.