Explanation

After a long, hard practice in hot weather, naturally the players would be tired. Flagging and enervated are the only choices that mean “tired.”

Hence flagging, enervated are best fit!
_________________

Flagging means languid or weak. Lissome means supple or ductile.

another way to answer this:
look at all the options and find a pair of synonym words. There's only one pair among the choices, which is flagging and enervated.

Hale - strong and healthy. Exactly opposite.

After a long, hard practice in the summer sun, the players were visibly _________ .

Two Answers
flagging
hale
lissome
loathsome
vigorous
enervated

I think the answer choices need to be reconsidered. It should be enervated rather than vigorous

Hello from the GRE Prep Club VerbalBot!

Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.