Sometimes you can be so tired that even the warm up can feel exhausting and you don't understand how people expect you to play a whole match after such an intense warm up session. You're only human. So you'll probably pick out the teammate whom you trust the most and in your out of breathe state say "I think I'm dying" to which she'll (hopefully) respond "that was hard." If you're not mentally prepared for a game then it will feel like you're the least fittest person on your team, which isn't the case. Besides, high knees during any warm up is never going to get easier.
