What are the main differences between a stair stepper and a stair mill, and which one is more effective for cardiovascular fitness and lower body strength training?

The main difference between a stair stepper and a stair mill is the motion they simulate. A stair stepper mimics the motion of climbing stairs, while a stair mill replicates the motion of walking or running up an endless staircase.

In terms of effectiveness for cardiovascular fitness and lower body strength training, both machines can be beneficial. The stair mill may be more effective for cardiovascular fitness as it typically offers a higher intensity workout due to the continuous climbing motion. On the other hand, the stair stepper may be more effective for lower body strength training as it targets specific muscle groups more directly. Ultimately, the choice between the two machines depends on individual fitness goals and preferences.