In which domain does the following objective fall? 'At the end of the lesson, the learner should be able to hit the football using the head.'

Hitting a football with the head is a physical skill, so the objective falls in the psychomotor domain.

The psychomotor domain covers muscular and coordinated bodily movement and motor skills.

The affective domain deals with attitudes, feelings, interests and values, not physical action.

The cognitive domain deals with knowledge and intellectual skills like recall and reasoning.

It is therefore not a mix of the affective and cognitive domains, since the act is essentially motor.

Bloom's taxonomy names three domains, with the psychomotor domain elaborated by Simpson and by Harrow.