This depends on how to say it. If you skip rope just for fitness, this kind of exercise is not intense, but if you skip rope for a long time and have strong training or competition, it should be intense.

Strength exercises should also be divided into two parts. Sometimes the exercises we do to achieve the strength of a certain part are not strenuous exercises, such as static exercises of muscle strength in bodybuilding. If you want to practice antagonistic strength in competitive sports, if the time and intensity reach a certain level, then this sport should be strenuous.