Final answer:
The coordinator in the sentence is 'yet', which is an adversative conjunction, indicating a contrast between being excellent sportsmen and not being able to dance. . They were excellent sportsmen, yet they could not dance.
Step-by-step explanation:
To underline the coordinators in the sentence and write what type they are, we can look at the sentence provided:
"They were excellent sportsmen, yet they could not dance."
The coordinator 'yet' is an adversative conjunction because it introduces a contrast or opposition between two ideas. Adversative coordinators include 'but', 'yet', and 'however', which all serve to show discrepancy or contradiction.
In the context of the information provided, successful athletes may have qualities like physical ability and mental toughness, but that does not necessarily mean they can excel in every physical domain, such as dancing.