Below is translated with AI so there might be some strange wordings... :)
AMRAP is simply an abbreviation and stands for As Many Repeats / Rounds As Possible . In other words - as many repetitions or rounds, of a certain list of movements, as you can manage, during a certain period of time, for example 20 minutes.
R thus stands for repetitions or rounds. An example of when it can go wrong is if you are given a "list" of exercises/movements that all have a number of repetitions attached to them and you are asked to do it AMRAP. Yes, then you should do as many "rounds" as possible where you follow the number of repetitions for each exercise. If instead you get a time interval for an exercise in AMRAP, then you do as many repetitions as you can in that time. However, the idea is the same regardless of whether it is repetitions or rounds. You should only rest if you MUST! The intensity must be kept as high as possible.
Crossfit is quite famous for training sessions with AMRAP elements. The good thing is that you can quite easily keep track of how much you can do and you can easily measure your own development and above all - compete with yourself on your own terms. It's a great feeling to be able to push on and complete something 4 times, if at a previous training session you were about to die in 3 rounds.
It is precisely the intensity that is good with this type of training. By pushing yourself to reach a certain number of rounds or repetitions, the training naturally becomes high intensity. High intensity training is good in lots of different ways, which you can read more about here .
In addition to the fact that AMRAP exercises are very good training, it is also a simple way to train, for example, at home or on the road. You can easily put together a series of strength exercises that only involve your own body weight and then perform them AMRAP for 15 min. With "adding more rounds" becoming a way to develop, one does not necessarily need to add more weight to the exercises to continue to see positive development.