ProForm Trainer HL EllipticalStep up to new heights on the Proform Trainer HL. Combining the movement of climbing stairs with the intensity of boxing, each workout helps you activate more muscles throughout your whole body while burning more calories.[[bottom_description]]What is HIIT? High Intensity Interval Training, or HIIT, is a training technique that involves repetitively giving 100% effort for a set amount of time followed by short recovery periods. You'll get and keep