High intensity and how many beats per minute classify a workout to be high intensity? What activities do you do that would be considered a high intensity workout?

What is a high intensity workout that you would like to try?

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.