Two providers are performing cpr. what should they do to prevent fatigue and maintain the quality of chest compressions?

The thing that they should do to prevent fatigue and maintain the quality of chest compressions is: Change positions every 2 minutes.
Giving a CPR require someone to stay in one place and doing the same movement over and over again (such as chest compression)

IF we do a CPR more than 2 minute, our body will start to feel fatigue that could decrease the quality of our CPR. If we have 2 persons doing a cpr, changing position every 2 minutes will help maintaining this quality.