Sure, there are some minimalistic workouts and training that can be completed in less than 45 minutes. Such workouts can consist of compound exercises which allow for more than one primary muscle group or joint to be worked, making exercise time efficient and beneficial. For instance, thin belt treadmill walking coupled with dynamic stretching routines could be followed by flat dumbbell press, dumbbell Romanian deadlift, two-grip lat pulldown, standing dumbbell step, overhead cable tricep press, machine lateral raises and horizontal donkey toe press for calves. Each of the above exercises can be performed in two sets of unusual repetitious focusing on strength and size hypertrophy.