"Intensity exercise" refers to physical activity that is done at a high level of effort or exertion, where you are pushing your body and working hard. Full definition
He explains that people are not meant to keep up with high intensity exercises for a long period. (fitnessandpower.com)
Make sure that you set the lowest intensity exercise in order to keep your dog happy. (happyjackrussell.com)
The other pathway is known as the aerobic pathway, and your body uses this for low to moderate intensity exercise such as power walking. (rachaelattard.com)