"Maximum intensity" refers to the highest level or amount of force, energy, or activity that something can reach. It indicates the limit or peak of intensity in a particular situation. Full definition
A proper dynamic warm - up is an important step to prepare an athlete's body to perform at maximum intensity during a workout, training session, and competition. (blog.bridgeathletic.com)
Most important, make sure that you train with maximum intensity in every set for all exercises. (fitnessandpower.com)
Get creative, but make sure you are reaching maximum intensity. (coachcalorie.com)