remember to

forget to ~ / ~ ing

remember to ~ / ~ ing

regret to ~ / ~ ing

 

They are in the swimming pool Because it is important to remember to do light exercise before a tough sport, they should remember to warm up. They actually forgot warming up before. As long as it is necessary for them to warm up for a few minutes, they do a warming-up exercise before swimming.

They are swimmers and they are competing with each other.